The Mystery of the Talking Skull
Robert Arthur
Paperback
(Armada Bks., Jan. 1, 1973)
When Jupiter buys an old trunk, he's stunned to find a skull inside - especially one that talks! The skull gives him a muddle of information about disappearing victims and hidden wealth. It just doesn't make sense. And are the clues hidden in the trunk, or in the skull itself? Whether they like it or not, the Three Investigators have another mystery to solve....