This book is a compilation of books 1-4 of "RJ - Boy Detective", fun short story mysteries for children ages 9-12. Each short story is around 30-35 pages long. It includes the following books: *The Mysterious Crate *Vampire Hunting *Alien Goo! *Mystery Poo! RJ Spencer is a lucky 12 year old. He lives in the big city and his parents are landlords of the high-rise apartment building that is his home. The many tenants in the building, along with the endless possibilities of adventures in the city itself, are the perfect setting for the young detective as he sets out to solve every case he can get his hands on.