Maggie and Cal work against the clock in a daring medical rescue, and in the process discover a clue to the whereabouts of a missing camper. Maggie learns a little more about Cal’s past, while Sully receives disturbing news.

Sully tries to hold things together at Sullivan's Crossing, while Maggie attempts to navigate complications back in Boston, Mass.

Maggie struggles to make sense of her personal life. Sully deals with some financial challenges.

Maggie's medical training is put to the test as she races against the clock to save the life of a friend.

Maggie returns to Boston prepared to face the consequences of her actions, while Cal searches for closure of his own.