Andy Russell, Not Wanted by the Police — David A. Adler

Andy Russell's neighbors have asked nine-year-old Andy and his best friend, Tamika, to watch their house while they are away. But when Andy sees unexplained lights and movements, he becomes convinced there is an intruder next door! The problem is . . . whenever he tries to show his family and the police what he sees, everything is back to normal. Now Detective Andy Russell must prove that he's not just a pest--that there is something suspicious going on!