Mick makes some unpopular business decisions when he plans to sell the nightclub that he and Trace had built together. When planning her cousin’s wedding goes awry, Jess turns to an unexpected source for help. Bree fights to regain control in the production of her play.

Just in time for the Chesapeake Shores Oyster Festival, Trace returns to Abby after three months on tour, only to discover a family in turmoil: Bree's completed manuscript turns out to be a thinly veiled story of the family, and Mick ends the fight over the family Trust but begins a feud with Connor after a fateful mistake.

While Jess and Bree discover David's parents' secret plans, Abby joins Trace on tour, realizing that it will be impossible to stay clear of Trace's newfound fame. Thomas's vow renewal sparks Mick and Megan to re-examine their own relationship, as Connor reconciles with Kevin.

Chaos reigns with the closure of the Bridge, and the O'Briens are at war over Bree's manuscript. Meanwhile, Kevin is heartbroken visiting Sarah's family in Philadelphia, especially after he's offered his dream job back in Chesapeake Shores. When Trace realizes that he might not return to Chesapeake Shores, his relationship with Abby is cast into doubt, as Jess wonders if her relationship with David can survive without the B&B.

On the eve of the Chesapeake Shores Regatta, with Mick recruiting family members to join him on the water, Abby finally has to make a decision whether or not to break up with Trace for good. Meanwhile, Bree's relationship with Simon is rocked when Caroline appears, and David and Jess have to finally figure out their relationship without the B&B. In a surprise twist, a letter from Ireland might decide Nell's future.

Kevin mulls marriage with Sarah; Jess and David run their new B&B in Tanglewood; and Abby and Mick both discover that their careers are in jeopardy.

The play is in jeopardy, it's Abby and Trace to rescue. David and Jess learn to work together, Bree learns to work alone. Mick and Megan come together while Connor goes it alone. Kevin and Sara return with a surprise announcement.

Trace rethinks sharing ownership of The Bridge with Mick. Jay helps Abby reconsider her priorities. Jess and David find themselves hosting guests before they are ready. Connor pursues an intriguing new opportunity. Kevin and Sarah discuss their future. Bree prepares for opening day of her play.

As season four comes to a close, Trace and the O’Briens face decisions affecting their personal and professional lives. Trace weighs his relationship with Emma against her musical potential. Abby and Connor consider new career paths, while a new agent has Bree questioning what’s next.