My attic is a dark, cramped space with no windows and a ton of insulation. What kind of attic do you have where someone living up there can see and hear everything that happens in the main living space?
Or rather, what have you done to think that someone with a complete dossier on you has resorted to occupying your attic in order to get the jump on you?
These days if you find someone living in your attic then it’s most likely a drifter looking for shelter. Better to find a man down on his luck than a large colony of pests.