Shadow answered a call from the local university women’s residence, regarding a suspected prowler. Accompanied by the Head Mistress, Shadow inspected every room in the residence. Concluding his inspection on the third floor, Shadow surmised that the suspect was probably on that floor and quite likely a friend of the girl in 3A or 3B. A few minutes later another officer found the intruder and confirmed Shadow’s suspicion. What clue could have led Shadow to suspect the intruder to be on the third floor and quite likely a guest?
Solution
Shadow noticed a toilet seat was left up (an unlikely state in a women’s residence) and concluded a prowler would not stop to use the bathroom, but an invited guest, like a boyfriend, would.