“It’s all strange...” - young detectives Holly, Pete and Miranda shake their heads in puzzlement, looking at the abandoned house overgrown with weeds. And indeed: no one has lived in it for a long time, and yet some mysterious boxes are piled up outside the windows, which also appear and disappear. Moreover, at night the beam of a flashlight darts in deserted rooms, and one day an ominous flash cuts through the darkness! “Yes, it seems it’s time for us to tackle a new mystery,” the guys think and decide to start by taking the house under constant surveillance. This is where the idea of killing two birds with one stone comes to the friends’ minds...