Elizabeth receives a sentimental surprise in time for Little Jack's first day of school. Nathan trains a new Mountie cadet. Rosemary and Lee make a landmark decision.

When the comic book craze sweeps Hope Valley, Elizabeth teaches her students through nature. Rosemary launches a radio show, and Lucas meets a new political player.

Elizabeth and Nathan uncover Oliver's secret. Rosemary worries Lee has a secret of his own. Allie's interest is piqued when Earl Wyatt returns to town.

Elizabeth helps Allie plan a birthday dance. Nathan struggles with Allie growing up. Rosemary and Bill team up again to investigate a train robbery. Lucas lends Edie a hand.

Elizabeth develops a new method of teaching. Nathan goes undercover. A familiar face returns to Hope Valley with an unlucky heiress in tow. Lucas and Lee face their differences.

Allie and Oliver discover a threat. Rosemary invites the kids to debate Lucas on the radio. Bill interrogates a suspect with an old friend's help. Elizabeth fights a cold.

Elizabeth and Nathan's date night leads to an undercover operation at a glamorous party. Lucas and Edie grow closer over cards. Rosemary holds auditions for a play.

Rosemary's play gets a new venue and a new cast. Elizabeth takes her curriculum to the airwaves. Faith helps a friend make a decision. Lucas faces unexpected opposition.

The Garrison Gang comes for their gold with Hope Valley residents in the crosshairs. Angela visits the Schwartzman School and Rosemary uncovers the truth about Ava.

When Little Jack falls ill, Elizabeth and Nathan care for him together as Hickam and Mei race to secure medicine. The kids broadcast a baseball game over the radio to lift spirits.

As graduation approaches, Elizabeth and Nathan plan for a happy summer together. Lucas and Edie race Rosemary and Bill to find the gold. The town plans a sweet surprise for Minnie.

The land dispute around McGinty's Meadow intensifies. Hickam and Mei throw a harvest festival for the town. Elizabeth helps Emily find her purpose.