Petunia's birthday is today, and she's got everything a birthday girl needs: an excited smile, the perfect bow, a big party. Wait ... where is the party?! It was just here a second ago! The balloons, streamers, and guests are all gone!! In a mad dash to find it, Petunia calls the best detective in town, Agent Lion. He runs through the halls, follows clues, and even takes a quick swim--but will Agent Lion find Petunia's celebration in time?