Read the criminal case, assemble the puzzle, solve the case. During a dive through the sunken city of Submaris, the three ??? are pursued by strange shadows. Is there a monster at work here? The detectives must solve the mystery, and players can help them: first, read the thrilling short story, then piece together the crime scene and find the hidden clues. The included mysterious treasure map assists children in solving the exciting case. Cool puzzle fun for aspiring detectives. Contents: 150-piece puzzle (size: 48 x 36.5 cm), 2 gadgets (treasure map + sticker sheet), 20-page guide with an exclusive short story and solution section.