If your life were an ABBA song, which one would it be? Right now, Maggie Corcoran is facing her own private Waterloo. On the day her cancer treatment begins, Maggie discovers that ABBA are reforming in Stockholm for one concert only, and suddenly she has a dream. She must bring together the Abbaholics fan club she formed as a teenager to travel to the show. But Maggie soon discovers that not everyone wants to go back in time...