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.

Five years after meeting her three fathers, Sophie Sheridan prepares to open her mother’s hotel. In 1979, young Donna Sheridan meets the men who each could be Sophie’s biological father.