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 fathers 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-mysteriesthat] will find a ready audience.`` (Booklist )