DAVID A. ADLER is the award-winning author of more than a hundred and fifty books for young people, including his popular Cam Jansen series. He lives with his family on Long Island, New York.

LEANNE FRANSON is a popular Canadian illustrator who is now bringing her talents to the United States. She lives in Montreal, Quebec.

Andy Russells 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!