While everyone prepares for the grand opening of Rob's new restaurant, Frank watches over Edna as she recovers at home. Cal finally makes the decision to confront Maggie with his concerns as Rafe tries to get Sydney to listen to how he feels. Meanwhile, Jacob rushes things with Lola making her uncomfortable, and Sully gets a surprise visitor that helps him realise he needs to take a new direction. Plus, Maggie finally reconciles her head with her heart just as someone from her past arrives with a shocking revelation.

On the two-hour season finale of Sullivan's Crossing, after being admitted to the hospital, Edna learns the reason behind her vision loss, and Maggie discovers there's more to the diagnosis than they first thought. Meanwhile, Sully is facing a difficult decision of his own.

Maggie continues to be stumped by the cause of Glenn's illness. Sully decides to reach out to Helen after her sudden departure from the Crossing. Rob encourages Sydney to be honest with Rafe, and Jacob's lichen research leads Maggie to a surprising discovery.

Maggie, Sully, Sydney, Rob, Frank, and Edna head out to help Cal and the Search and Rescue team search the surrounding woods for missing Lola and Jacob. Maggie is asked to consult on a medical case where a patient is displaying neurological symptoms, only to be shocked when she learns the patient's identity.

Everyone works together to help Rob meet the deadline he's been given to renovate the new restaurant, while Maggie tries to smooth things over with Cal. Helen attempts to get Sully to step outside his comfort zone, while Frank takes Edna to the doctor to try and help her deal with the symptoms of menopause. Lola and Jacob find themselves in jeopardy after heading into the woods to collect lichen samples.

After returning to the Crossing from upstate New York, Maggie starts to realize that Cal may still be struggling emotionally from his trip home which causes her to ask him to slow things down. Sully and Helen begin to connect as Sydney and Rafe reach a possible breaking point in their relationship. Rob and Jane reconnect after a chance run in.

Cal struggles to forgive his parents for his difficult childhood as Maggie helps Cal find a new perspective to help him reconnect with his father before it's too late. Sully comes up with a novel idea to help Rob, after Sydney confides in him about Rob's situation. Frank offers to help Jacob collect samples for his research and the two make a shocking discovery that might be the answer Sully needs to take down his competitor.

Maggie and Cal visit Cal's parents' farmhouse in upstate New York after Cal's mom Marissa calls with news that Cal's father Jed is sick. Cal is shocked to discover that his father has finally started treating his schizophrenia, opening unresolved feelings from Cal's childhood. Sully and Frank try to figure out who's developing the land adjacent to the Crossing, and Helen attempts to take Sully's mind off things. Meanwhile, Jacob asks Lola to show him around, and Rob and Sydney look for a new location for their new diner. 

Maggie and Cal hope to get their relationship back on track by planning a romantic picnic together. However, their date is interrupted when Cal gets his first Search and Rescue alert. Sully sees Helen in a new light as they begin to bond over their mutual love of birdwatching, but their trip into the forest takes a turn with a shocking discovery. Meanwhile, Frank and Edna prepare for the arrival of Frank's cousin, and Lola has an awkward run-in with a handsome stranger on a girls' night out.

Maggie has officially packed up her life in Boston and moved to Nova Scotia to help run the Outpost and make Sullivan's Crossing her home. Though she wants to finally take her relationship with Cal to the next level, she finds herself struggling to connect with him. Edna and Frank make some much-needed changes at the store rubbing certain people the wrong way, and bestselling author, Helen, comes to the Crossing to finish her new book. Sydney and Rafe get caught in a compromising position by Rafe's new boss, Cooper, and Rob receives distressing news from the insurance company.