Jessi and the Jewel Thieves — Ann M. Martin

America's favorite baby-sitters are detectives, too!

Jessi can't wait to get to New York City to see her friend Quint dance in his first big ballet. What could be more exciting? Lots!

Jessi and Quint overhear two men discussing a jewel heist! Jessi wants to go straight to the police. But Quint thinks they need more evidence. So the two begin tailing the men -- all over the city. But are Jessi and Quint too busy watching the thieves to realize that the thieves are watching them?!