It could be about a child killer who gets hold of a clown costume. Every year, he scopes out a neighborhood, and looks for the most nastiest kids out there. He kidnaps each child, locks them in a make shift catacomb/maze on his property (complete with booby traps), then puts on the clown costume to embrace the clown/beast within. The kids would have to work together to outwit the killer/clown, escape his dungeon, and get out alive.