The Three ???, Shark Island (drei Fragezeichen)

A pirate movie is shot on Shark Island and the Three ??? visit the movie set. Together with Peter´s dad, who is supervising the special effects, they spend a couple of days on the desert island to guard the equipment. But strange things happen. Peter´s dad goes missing and suddenly a real shark is circling around the island. The three detectives start their search. A secret underground tunnel lead...