The Three Investigators and the Treasure of the Monks: I need to speak to Peter Shaw. It's urgent. What is it about, Mister? - It's about his life. - Peter was actually just looking for a suitable filming location for a school project. But in the abandoned factory hall, he finds more than just an atmospheric setting for the planned crime film... The Seven Gates: Who is the eerie Mr. Carter, who lives in a gloomy castle and looks like a gaunt bird? His task for the three ??? is also more than strange: "Find the hideout at the seven gates." What initially sounds harmless turns out to be an extremely dangerous undertaking. Justus, Peter, and Bob must enter rooms whose doors they would have been better off not opening, and in doing so, they discover incredible things... Dangerous Quiz: High tension in the studio: The camera is rolling, the spotlight is on Justus.