Barbie, her sisters and their loyal puppies are enjoying a beautiful day at the beach. But the otherwise ordinary day takes an unexpected turn, when visiting Barbie's friend Teresa at the lifeguard station. Teresa reveals four sandy bottles she has stumbled upon, each of them containing a message! Could these be secret messages? Another major mystery case for 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!