This is a proposal for an imagined scenario where the infill project is inhabited by a detective and a cartographer who is a yet-to-be discovered serial killer. The house then becomes a game board of their interaction: the detective's investigation of the serial killer, and the serial killer's manipulation of that investigation With two different pathways, the detective and the serial killer both have an advantage that would compromise each others' activity: The detective has access to all rooms within the house expect for the serial kill- er's private space and the serial killer has a spying space that allows him to have visual or auditory access to all rooms expect for the detective's private thinking space.