Students of the Blue Reef School are not used to being bored. This time the guys decided to make their own film, and the main role went to the shark boy Thiago! Friends will have to write a script and master acting skills. It will be fun! But at this time, some of their classmates begin to behave very suspiciously. It's like they're hiding something. Thiago is very worried about this: maybe the enemies of their school, led by Lydia Lennox, are plotting something again and this time they have attracted students? Thiago will have to become not only an actor, but also a detective!