Sammy Keyes and the Hotel Thief is the first book in Wendelin Van Draanen's hilarious Sammy Keyes series. These books are modern-day mysteries centered around Sammy, the troublemaking teenage girl who always seems to solve the crimes before the police do. (I think Nancy Drew had better move over and make room for Sammy!)
This is a great series for girls and boys around 4th grade and higher, readers who enjoy mysteries and funny, smart characters. It's also fine to start the series with Sammy Keyes and the Skeleton Man.