Years ago, during a certain summer in Maine, two young women, unaware of each other, met a charismatic man at a craft fair and each had a brief affair with him. For Jane, it was a chance to bury her recent pain in raw passion and redirect her life. For Susie, it was a fling that gave her troubled marriage a way forward. Now, 16 years later, the family lives these women have made are suddenly upended when their teenage girls meet as strangers on social media. They concoct a plan to spend the summer in Maine with the man who is their biological father. Their determination puts them on a collision course with their mothers, who must finally meet and acknowledge their shared past and join forces as they risk losing their only daughters to a man they barely know.

Practical Rex is a rule keeper. Sparkling and unconventional Rosie lives to break the rules. When Rex and Rosie divorce, their daughter, Willow, must navigate their opposing worldviews as she shuffles between them. But Willow just wants to be with fun-loving Rosie, to bask in her mother’s enchanting glow, the parent who lets her stay up late, miss school and eat candy for breakfast. Rosie’s seemingly outsized love fills a void within Willow. But as her mother’s behavior becomes erratic, her father must step in to shield Willow. Blinded by Rosie’s brilliance, Willow resents Rex’s interference, unable to recognize his kind of love. Rex has removed his Rosie colored glasses. Now Willow struggles to do the same without diminishing her deep love for her mother.