A new midwife arrives at Nonnatus House, and finds it hard to fit into her new role. Meanwhile, Chummy moves into the mother-and-baby home, Trixie helps a young boy in terrible need, and Sister Evangelina is in denial about her illness.

As dysentery sweeps through the area Trixie takes on her first official duty since her engagement to vicar Tom by organizing the Rose of Poplar contest whilst Phyllis is concerned for sickly Dolores McEvoy, who is living in a filthy hostel apart from her husband but is too ashamed to give the address. When Phyllis locates the hostel she also finds the source of the dysentery. Meanwhile young father-to-be Tony Amos is the victim of police entrapment when he goes cruising in a men's toilet. Dr Turner speaks up for him when he is taken to court but, although prison is avoided, bigoted attitudes make life difficult for him and his wife and the nurses' opinions are divided.

Sister Winifred meets a young prostitute and begins a campaign to improve the lives of women like her, Trixie reconsiders her engagement when Tom is offered a post in Newcastle, and Sister Monica Joan is unexpectedly called into action.

Sister Mary Cynthia returns to Nonnatus House, Barbara has trouble communicating with a pregnant Sylheti woman, Shelagh helps Patrick with his exhausting workload, and Trixie struggles to cope with her pain.

Phyllis deals with a diabetic teenager who has fallen pregnant, Sister Mary Cynthia comes into contact with a group of Irish Travellers, and Patsy organizes a square dance to raise money for the Cubs' trip to Norfolk.

A pair of school friends are unexpectedly reunited in the delivery room, and a mix up results in complications for both. Meanwhile, Barbara helps a couple in need of assistance, and Patsy's secret relationship with Delia pains them both.

Trixie and Sister Mary Cynthia help a deaf-and-dumb woman, and Barbara has a baffling case. Meanwhile, Fred's daughter arrives from Birmingham and interferes with his and Violet's engagement, and Delia has a proposal for Patsy.

As Christmas approaches, an outbreak of measles hits Poplar. Meanwhile, Tom receives an intriguing offer from the BBC, a face from Patsy's past returns, and Sister Monica Joan goes missing.

As Easter approaches, the nuns prepare for celebrations, Trixie is taken up with a new exercise class, Patsy awaits Delia's decision, and the group are shaken by the birth of a severely deformed baby.

Tom and Trixie work together to help a young couple, Barbara wrestles with her conscience, and Sister Julienne is seconded to a maternity hospital, where she discovers the emergence of a worrying pattern.

Phyllis becomes concerned about a new mother who is finding it difficult to cope, Fred must step in to help run the shop when Violet is injured, while Timothy makes Patrick have a realization.

A series of attacks on young women in Poplar has a direct impact on the residents of Nonnatus House, Trixie is suspicious about a patient whose pregnancy has not been reported, while Patrick and Shelagh take a trip.

Patrick is horrified to learn that a medication prescribed to expectant mothers may be the cause of the recent birth defects in Poplar, while the Nonnatus House residents and the community at large are devastated when tragedy strikes.

A group from Nonnatus House travels overseas in order to assist a struggling clinic in South Africa.

The Nonnatus House staff face great change, Phyllis and Barbara help a battered wife, while Sister Mary Cynthia becomes increasingly fragile.

An explosion at the docks badly affects the husband of a new mother, Patsy feels under pressure, and Sister Ursula continues to test the patience of everyone at Nonnatus House.

Sister Ursula continues to make life difficult for the staff of Nonnatus House, while sweeping reforms place the maternity unit under threat.

Nonnatus House advertises for a new midwife, while Trixie, Sister Winifred and Tom help an expectant mother in a difficult situation.

Nonnatus House welcomes a new recruit, Fred and Violet take in a vulnerable young man, Sister Monica Joan makes a discovery, and Trixie meets a charming dentist.

As the Cuban Missile Crisis brings fear to Poplar, Sister Julienne tries to arrange the return of Sister Mary Cynthia, while Valerie deals with a very challenging case.

A new contraceptive clinic adjacent to the Nonnatus maternity unit causes trouble, while an unexpected letter to Barbara sends everyone into a frenzy.

As the year comes to an end, Poplar faces unprecedented and relentless wintry conditions, which pose a challenge to the occupants of Nonnatus House and the community at large.

As the Big Freeze of 1963 continues, Nonnatus House welcomes their newest midwife, while contending with the effects of the weather.

As Lucille settles into her duties, she faces prejudice from a patient's mother, while Sister Winifred opens her mothercraft classes up to fathers, and the Turners meet their new au pair.

A patient of Phyllis' receives a devastating diagnosis, Fred and Violet organise a beauty pageant, Magda discloses a secret, and Trixie makes a tough decision.

The Turners attempt to improve the life of a young man from a remand home, Lucille finds unexpected friendship, while Nonnatus House is filled with worry for Barbara.

A nearby maternity home closes, bringing new patients to Nonnatus, while Tom deals with his grief and Sister Monica Joan is given a surprise.

As Christmas approaches, Sisters Julienne and Winifred are called to the Mother House, where important decisions must be made. Meanwhile, Trixie returns from Italy, and the midwives help with a difficult birth.

As two new nuns join Nonnatus House, a shocking case exposes the seedier side of Poplar, while a complicated birth tests Trixie and Phyllis.

As Violet runs for election as a councillor, Lucille befriends an elderly woman facing eviction, and Sister Hilda supports a Ghanaian family suffering from a mysterious illness.

A troubled mother receives support from Shelagh and an unexpected source, Valerie helps a woman whose child is born with a cleft palate, and Phyllis has ambitious plans for the Whitsun bank holiday.

A friend of Trixie's finds herself in an impossible situation, while Sister Julienne endeavors to mend a fractured-mother daughter relationship.

A young bride-to-be suffers an identity crisis after the diagnosis of a hidden condition, an expectant father is diagnosed with a rare condition himself, and romance is in the air for Lucille.

When Phyllis is admitted to hospital, Mother Mildred returns to cover her assignments, and soon causes a stir, while Lucille cares for an unwed teenager who wants to keep her baby.

A woman's pregnancy is affected by her husband's infidelity, Sister Frances faces her first solo delivery, Shelagh receives news about May, and Valerie's loyalty is tested.

As Shelagh plans a ball to raise money for new medical equipment, Valerie must come to terms with recent events, while Sister Hilda assists a terminally ill young woman.

The midwives answer the call for medical help in the Outer Hebrides.

In January 1965, a diphtheria outbreak sweeps through Poplar and Mother Mildred seeks to help a distraught woman who abandoned her newborn.

Sister Julienne intervenes in the case of a pregnant prostitute, a family's plan to leave Poplar are up in the air when a mysterious illness strikes, and Sgt. Woolf faces a health crisis of his own.

Lucille encounters a defiant expectant mother who is less than kind, Phyllis attempts to help an immigrant mother with an alarming medical condition, and Shelagh and Trixie put on a fashion show to raise funds for the maternity home.

Nonnatus House welcomes four male junior doctors to live and work among the midwives while Fred tries to help a sick man whose home is to be demolished.

The plight of a harried matriarch profoundly affects Sister Julienne and Sister Frances, while Sister Hilda helps a nervous expectant father.

Valerie's cousin Maureen endures a difficult labor and subsequent issues, while the Turners' adoption of May comes under threat.

Trixie helps a blind mother care for her new baby, Kevin makes an error which troubles Sister Frances, and Valerie becomes concerned for her grandmother.

The local council threatens to cut funding to Nonnatus House, which may face demolition. Two pregnant women discover they have something surprising in common.

Sister Monica Joan is rushed to hospital, while Trixie is less than impressed to receive a subscription to a Marriage Bureau as a Christmas present. Meanwhile, the circus is in town.

Sister Julienne and Doctor Turner clash over whether to provide a private care service. Then a distressing birth raises fears of another Thalidomide case.

Sister Hilda and Doctor Turner are involved with a young woman whose health presents a series of challenges. A complicated pregnancy leads the Nonnatus House team on a path of discovery.

As the World Cup draws near Fred places a risky bet on the final. Nonnatus House welcomes four new pupil midwives, Dr Turner meets a 17-year-old boy harboring a desperate secret, and Cyril and Lucille's relationship continues to blossom.

With sister Julienne away on a refresher course, sister Hilda steps in to carry out home visits. The new pupil midwives are settling in well, and there is a sense of hope in the air. While examining expectant mother Vera Sands during a routine visit, sister Julienne is concerned by her toddler daughter who is displaying troubling symptoms. Determined to find out what's wrong, sister Julienne and Dr Turner are on the case. Meanwhile, an overly protective mother struggles to cope with her daughter's teenage pregnancy and is insistent on keeping it low key, much to the frustration of new pupil midwife Nancy Corrigan.

Trixie stirs up controversy in the community when she speaks out on behalf of a patient who is pregnant with her fifth child, but whose personal life is far from stable. Dr Turner and Sister Frances try to help a woman who is refusing medical treatment through the last weeks of her pregnancy, and Nancy reveals a secret about her background that could threaten her relationship with Nonnatus House.

The Nonnatus House staff struggles to come to terms with Nancy's revelation. Sister Frances and Trixie rally the others to take a stand and do something about Poplar's growing housing crisis. Sister Hilda relishes taking charge when Sister Julienne takes her annual leave, Timothy Turner prepares to leave for medical school, and Cyril is forced to reconsider his future after he receives news from home. A very special baby is born, causing a rift in a close-knit family and leading many people to count their blessings.

Lucille and Cyril are excited about their wedding but as the day approaches, nothing seems to run smoothly, and the ceremony itself is put in jeopardy.

Demolition work in Poplar uncovers a long-buried secret that leads to a testing and emotional case for the team. Sister Julienne takes on a sensitive delivery.

Shelagh organizes a special celebration to mark 100 years since the Order first arrived in Poplar - although Sister Hilda feels that she should have been in charge of the festivities.

Trixie has been assigned to a complicated case involving a crane driver who was injured in a workplace accident and is now paraplegic. Meanwhile, Nancy and Sister Frances give a talk on the facts of life at a primary school.

An unforeseen event in Poplar means that Nonnatus House suffers its biggest threat yet. But this time it's not the bricks and mortar that are in danger - it's the people.

Nonnatus House faces its darkest day after a tragic incident in the heart of Poplar. As the community rallies together, the team must overcome personal anguish to help the injured.

It's April 1968 and change is coming to Nonnatus House. Racial tensions cast a shadow over Poplar, and the sisters welcome a new recruit.

The Turners support a family still suffering the devastating effects of thalidomide, Miss Higgins is involved in an unexpected delivery, and the community stages a talent show.

At a coffee morning for expectant mothers, Sister Julienne meets heavily pregnant Lilian Reynolds, who is expecting her first child.

The maternity home is thrown into chaos by an outbreak of gastroenteritis, and Nurse Crane fights to save her career. Meanwhile, Cyril encourages Reggie to seek help.

A pregnant mother with a chronic heart condition falls unwell. Nancy grows suspicious of a young father's erratic behaviour, and Matthew prepares for a visit from his father.

Trixie supports an underage mother through a difficult time, Monica Joan welcomes an unusual guest to Nonnatus House, and Sister Veronica spearheads a new council initiative.

Nancy makes a home visit to Imelda O'Connor, and is surprised that Imelda, her husband Maurice and young son Paul are living in a cramped caravan on a building site.

Dr Turner experiences the biggest test of his career, while Trixie's approaching nuptials cause stress levels to escalate. Sister Julienne hatches a plan to save Nonnatus House.