Morgan III Charles E. Morgan III 
Case of the Stolen Jewelry [EPUB ebook] 

While collecting soda pop bottles, Jimmy Carson (Operative Three) makes a startling discovery. There are diamonds hidden inside a bottle! When he reports his find to Brains (X), the Benton and Carson International Detective Agency swings into high gear. Trying to find the jewel thieves leads them on a journey fraught with mystery and danger. Run ins with a gang of juvenile delinquents lead to some hair-raising trouble!