When neurosurgeon Maggie Sullivan's seemingly perfect life in Boston is turned upside down, she leaves the city and her boyfriend, Andrew, to return to her childhood home of Sullivan's Crossing in Nova Scotia.

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

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.