It's election time at Mouseford Academy and the candidates from the Lizard and Gecko student clubs face some challenges if they want to get elected president. Certainly not helping matters is the arrival of a mysterious black ship off the shores of the island . . . and it's trying to pollute the beach! The girls must use all their investigative skills to root out the connection between the ship and the campaign. The fates of the election and their beautiful island home is at stake!