It is a misty day at the beach, and Barbie's friends Teresa and Nikki are out having fun, while Barbie is at home helping her younger sister with a pesky bike chain. They decide to race each other, but the competition comes to a halt when they suddenly spot a mysterious, dragon-like figure in the water. What could this be?Better call the Sisters Mystery Club and their loyal puppies! No secret is safe from the super sleuthing sisters. Come on an amazing adventure with Barbie and all her friends! Solve mysteries with secret doors, sea monsters and messages in a bottle, catch the baddies as a secret agent, sing in Barbie's rock band, celebrate Chelsea's birthday in Dreamtopia and fly to tropical beaches and distant planets in far-away galaxies. Let's go!