In Birch Harbor, Michigan, four sisters are ready to start fresh... as soon as they settle the secrets of their past. On the verge of divorce, Megan Hannigan needs a distraction. So, she turns to the sunny tract of farmland left in her mother's will. It's the perfect locale for a budding business, but locals disagree. Only a third party can help navigate this pesky small-town grudge or else Megan's career plan is dead in the water. Meanwhile, Megan's oldest sister, Kate, hosts a grand opening for her newly renovated Heirloom Inn. Everything is going smoothly until her high school sweetheart reveals a disastrous confession. Amelia and her new flame are working to bring a local monument back to life. They figured the mysteries of the past were dead and buried, until Amelia accidentally discovers more information. Claire, a teacher, capitalizes on summer break by working on her new cottage and lounging near the water. But then her principal makes a midsummer request...and a new revelation shocks the shoreline and changes everything.