It's summer, it's sunny and it's Sunday. The car is packed, and Dad and the kids are on the way to Bornholm on vacation. But then comes the postman with a registered letter to Uncle Donald. He has inherited an estate on Funen, and he must urgently turn to take over the castle.
FBI agent Malcolm Turner goes back undercover as Big Momma, a slick-talking, slam-dunking Southern granny with attitude to spare! Now this granny must play nanny to three dysfunctional upper class kids in order to spy on their computer hacked dad.
Two teenage girls discover that mermaids really do exist after a violent storm washes one ashore. The mermaid, a sassy creature named Aquamarine, is determined to prove to her father that real love exists, and enlists the girls' help in winning the heart of a handsome lifeguard.
When the coach of the France soccer team is killed by a poisoned dart in the stadium in the end of a game, and his expensive and huge ring with the diamond Pink Panther disappears, the ambitious Chief Inspector Dreyfus assigns the worst police inspector Jacques Clouseau to the case.