Secret of the Tigers — Phyllis A. Whitney

THE HAUNTED CAVE
was hidden in the garden of Aunt Persis' Cape Town, South Africa home. For Lanny Dustin and Joel Monroe the cave -- rumored to be the den of a ghostly tiger -- held a special fascination. But Bernita Dustin felt any place Joel went was a place to avoid. Joel was a real know-it-all, always quoting facts and making fun of Benita's vivid imagination. Still, she wouldn't let it spoil her vacation. She'd forget all about Joel and her brother Lanny too, if he kept hanging around Joel.

Before long Benita couldn't just ignore the boys. Not after she saw the ghost tiger, and not when the three of them had a run-in with the strange man with a blue thumb. For then Joel and Benita were caught up in a dangerous mystery that they could only solve together through their special talents…!