The Casebusters race to catch a horsenapper!
Brian and Sean Quinn are two kids with a cool hobby: they're private detectives!
Brian and Sean have just begun a two-week summer vacation at a dude ranch in the Nevada mountains when they learn that an expensive racehorse has disappeared. The assumption is that it was a routine theft. But the boys track down some surprising evidence that suggests there is more to this case than meets the eye! The thief has a secret. When he traps the boys inside an old abandoned mine, one thing is deadly certain: he will do just about anything to keep the Casebusters quiet!