The Three Investigators must solve an old man's riddle to uncover a great fortune for their friend, Gus. But they're racing against a sinister bunch of treasure hunters who are also hot on the trail. Who will arrive first at the mysterious Fiery Eye?
The Black Moustache Gang are after "The Fiery Eye". So are the Three Investigators and they manage to outwit the thieves, or so they think.... but when Jupiter holds the gem at last, four gunmen emerge from the darkness! Black Moustache has caught up again....
From an Amazon Review: Bought this for the "Money Tree" story that I always remembered from my youth. The rest of the collection is very good as well. Glad I finally tracked this one down.
(Random House Books for Young Reader, May 27, 1985)
This is a Three Investigators mystery, among the most popular mysteries ever published for young readers. This story tells of a deserted old building by day--by night a castle of terror! What--or who haunts the castle? The Three Investigators are determined to find out--by visiting it in the dead of night!