Summer on Nantucket island. Three high-school friends drinking warm beer on a rooftop. Everything is cool, until a seemingly innocent game takes a sinister turn, and the course of their lives are changed forever. For a year, they keep it a secret—until the following summer when they meet a mysterious girl with her own dark past who may have the answers they're looking for. A story about friendship, mistakes, and questing for redemption, One Stupid Thing follows Jamie, Sophia, Trevor and Violet as they contend with the consequences of their choices, navigate the drama in their individual lives and try to uncover what really happened on that fateful night.