The Mystery of the Brobdingnagian Beast — Elizabeth Arthur

When Pete Crenshaw's father, a set construction manager, asks The Three Investigators for help in getting to the bottom of trouble on the set of the movie Bear Valley, the boys soon encounter threats, violence, a masked mob, explosions, and a man who believes he's the reincarnation of a 19th-century Pomo bear-doctor. But though a letter signed by the famous frontiersman Kit Carson may or may not be authentic, there's clearly a very authentic villain lurking in the shadows, and it's up to Jupiter, Pete, and Bob to follow the clues where they lead and nab him, if they can!