List of works by Michael Collins

The Mystery of the Dancing Devil

novel by Robert Arthur and William Arden

The Mystery of the Laughing Shadow

The Mystery of the Moaning Cave

1968 novel by Michael Collins

The Mystery of the Purple Pirate

The Mystery of the Shrinking House

The Secret of Phantom Lake

Three Investigators novel

The Secret of the Crooked Cat

book by Robert Arthur

The Three Investigators

novel series by Robert Arthur Jr.

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