Sophie Sheridan is getting married. All her best friends, including Ali and Lisa, will be joining her at her paradise island home and her mother Donna is pulling out all the stops to make sure that it’s a day to remember. But there will be one person sadly missing from the occasion, Sophie’s long-lost father, whom she is determined to find before the big day, with or without her mother’s help.
A chance discovery of her mother’s old diary from 1979 puts Sophie in the picture as to the whereabouts of her father but there are three possible candidates and Sophie has no way of finding out which one is her father. In a moment of madness she decides to invite Harry Bright (Brand), Bill Austion and Sam Carmichael to her wedding in the hope that she can befriend them and discover which one she shares a blood-tie with.