The Phantom Empire

One day, Professor Chambers' daughter has a chance to emerge from the shadow of her eminent parent. And all because in the mountainous part of California it is possible to find a cave ogre with a necklace of precious stones around his neck. Inspired by the idea of ​​finding an underground diamond mine, the girl gathers a team of adventurers and goes into the caves, not suspecting that instead of wealth she will encounter something much less pleasant.