Donna Sheridan, an independent, single mother who owns a small hotel on a Greek island, is preparing for her daughter's wedding, along with the help of her two old friends, Tanya and Rosie. Meanwhile Sophie, the spirited bride, has a plan. She secretly invites three of her mother's ex-lovers - Sam, Harry, and Bill - in hope of finding her biological father and having him escort her down the aisle on her big day.