Martha and her husband, Tom, visit Grey House. Cassie and Sam realize that they still have some things to learn about one another. Donovan's overbearing mother complicates his and Abigail's relationship. Grace and Luke go on their first date.

A long-lost map drums up some excitement in Middleton, as adventure seekers spring into action in "The Treasure." After finding the treasure map, Martha (Catherine Disher) sends Vincent (Gianpaolo Venuta) on a treasure hunt - which leads to an unexpected competition between Vincent and another treasure seeker. After finding out that his wish as a teenager was to make a discovery, Cassie (Catherine Bell) encourages Sam (James Denton) to keep his eyes open for mysteries to unlock, starting with this newly discovered map. Grace (Bailee Madison) is hurt to discover that Luke had been spying on Abigail (Sarah Power) for his Aunt Dotty - Donovan's (Marc Bendavid) mother. Abigail continues to spar with Dotty, until a crisis makes her reassess her relationship with Donovan. Meanwhile, Adam (Scott Cavalheiro) helps Stephanie (Kylee Evans) with the launch of her food truck.

A wish-granting comet heads to Middleton, adding even more anticipation to the exciting graduation season in 'The Comet.' As the rest of the town thinks of their one wish, Cassie (Catherine Bell) just wants the best for Sam (James Denton) when he is offered a dream job across the country after successfully performing a tricky surgery. Grace (Bailee Madison) prepares for her valedictorian speech, while Nick (Rhys Matthew Bond) becomes unexpectedly nostalgic as high school wraps up. Abigail (Sarah Power) plans a trip to Europe to forget about her breakup with Donovan (Marc Bendavid), while Donovan tries to disprove the power of curses and win her back. Meanwhile, Martha (Catherine Disher) struggles to make amends with her nemesis, and Stephanie (Kylee Evans) and Adam (Scott Cavalheiro) are overwhelmed when their food truck is an instant sensation.

Cassie and Sam celebrate their first wedding anniversary. Cassie welcomes Grey House guest Joy, who seems to be spying on the Merriwicks.

Cassie displays Nathaniel Merriwick's paintings for Grey House's 225th birthday.

Cassie and Martha smudge the mayor's mansion for her housewarming gala; Abigail and Donovan reunite and put up a final fight against the Merriwick-Davenport curse.

The curse has been broken. New romances, rekindled loves and weddings may be brewing in Middleton. What will happen when Donovan's brother visits? Will Adam return and finish what he started with Stephanie? The Merriwick women's mysterious satchels reveal their secrets.

Cassie and Sam's double date with hospital administrator Grant and his girlfriend, Monica, doesn't go quite as planned; Martha organizes a "Grease" themed movie night in the park.

Cassie and Sam are disagreeing about Sam's return to work after his injury; Flower Universe is trying to undercut Abigail's business, but she won't go down without a fight.

The pressure is on because strange things start happening to Cassie, Abigail and Joy's abilities.