Young Cam Jansen and the Library Mystery — David A. Adler

When Cam Jansen, her father, and her friend Eric go to the library, Cam finds a mystery to read. But soon, she has a mystery to solve. Her father's shopping list has disappeared. Cam decides to use her amazing skills to investigate, and with a click, she puts her photographic memory into action. Where was the list seen last? And where can it possibly be?

The Young Cam Jansen books are "appealing mini-mysteries [that] will find a ready audience." (Booklist )