Cassie (Catherine Bell) hosts a royal guest at Grey House in 'The Prince.' When shocking news emerges about the visiting royal, though, he risks hurting someone he's grown to care for. Sam (James Denton) gets a visit from an old friend in need of his medical expertise but soon discovers that his cure may lie in Cassie's intuition. Grace (Bailee Madison) starts an internship for Abigail (Sarah Power) at City Hall and faces fierce competition from a fellow intern. Their competition benefits Abigail, who needs all the help she can get when the rival mayor's family tries to build on the site of a Middleton landmark. Meanwhile, Martha (Catherine Disher) prepares for the first episode of her television show and Stephanie (Kylee Evans) considers her romantic options.

Cassie's enchanting powers have always helped her friends in Middleton and a special elixir gives her magical gift a potent boost in 'The Tea.' Cassie serves a special tea to help Abigail (Sarah Power) open up during a date with her former nemesis (Marc Bendavid), newly reinstated mayor Martha (Catherine Disher) share her opinions with an artist painting her portrait, and two guests at Grey House reconnect. Meanwhile, Sam (James Denton) looks for help teaching his new resident a lesson in bedside manner. Disappointed after her top choice college rejects her, Grace (Bailee Madison) opens up to her fellow intern. Nick (Rhys Matthew Bond), on the other hand, feels his confidence shaken when he receives a college acceptance letter and focuses his nervous energy on restoring a car. Meanwhile, Stephanie (Kylee Evans) debates a business partnership with a new love interest.

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.

Grace and Nick's graduation day arrives and Cassie tries her best to make the occasion truly magical.