A Sleepover Tail:(h2o #4)

Cleo tries to live a normal life by getting a job in the marine park, all the time knowing that one splash of water could turn her into a mermaid. Despite emma and rikki’s concerns about her new job, cleo manages to keep her secret safe. But when emma throws a sleepover party and a drink gets spilt, things get a little tricky. can the three friends manage to keep their fishy secret from others, or will all be revealed?