The guilt

The main question is, who left the front door unlocked? Billy says he can't remember if he locked it when he came home from the beach, is he lying? Peter doubts that when he got back from his date Billy was already home. When did the workers leave the premises? Jimmy thinks he saw the light in the garage, when he woke up because of the sound of the front door opening. He doesn't know whether it was Peter or Jimmy or one of the workers looking for something inside the house. The point is, somebody was here, inside, because the dog was barking, and in the morning Jimmy's stuff -- all the expensive stuff, laptop, cellphone, school bag -- was missing. So the question is, who was it who didn't turn the latch? Who didn't fasten the chain? Because that's the person who must pay Jimmy the damages. That's the person who's effectively guilty.