Young Cam Jansen and the Knock, Knock Mystery

David A. Adler is the author of more than 200 books, ranging from children’s series to books on math, science, and economics. His work includes the Young Cam Jansen series, the Andy Russell series, and a number of nonfiction and picture biography titles. He lives in Woodmere, New York.

Susanna Natti is an illustrator for young readers. The books she has illustrated include The Almost Awful Play and the Cam Jansen series of books. She lives in Bedford, Massachusetts.