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.

Rebellious, uncontrollable teenager, Rachel is hauled off by her dysfunctional mother to spend the summer with her estranged grandmother, Georgia. Her journey will lead all three women to revelations of buried family secrets and an understanding that - regardless what happens - the ties that bind can never be broken.