Cam Jansen & the Birthday Mystery

When Cam surprises both of her parents with a fortieth birthday party, the last thing on her mind is solving mysteries. But then Granny and Gramps call from the airport to say they have been robbed. Mr. and Mrs. Jansen rush to the airport, and don't even notice that Cam and Eric have climbed into the backseat of the car. Cam can't let her parents go to the airport without her. There is a mystery to solve, and a thief to catch. . .