It's so stupid and horrible. Deadryl and her daughter live on an island in Greece. Deadryl's daughter is about to get married and doesn't know who her dad is. Deadryl is a very strict, no nonsense mother. Her daughter finds out that when her mom was young she was actually a ***** who ****ed a lot of guys, and her dad may be one of 3 guys she was ****ing at the same time during one Summer.
So Deadryl's daughter locates all 3 guys and secretly invites them to the wedding, unbeknownst to Deadryl. She wants to find out who her real dad is.
All of this is set to ABBA's music with a gorgeous Greek island as the backdrop.