Book 41

Myst Creep-Shw Crooks

by M.V. Carey

Published 12 November 1985

Book 42

Mystery of Wreckers' Rock

by William Arden

Published 12 September 1986

Book 43

Mystery of the Cranky Collecto

by M.V. Carey and Robert Arthur

Published 12 September 1987
When an ornery book collector disappears, the Three Investigators break into his secret computer files in search of clues and gradually uncover his mysterious past.


Secret of Phantom Lake

by William Arden

Published December 1976
Three junior detectives investigate a mystery involving an Oriental chest, a sunken ship, and a baffling dual identity.

Htchck SEC Skelet Isld

by Robert Arthur

Published 12 August 1966

Three young sleuths discover who is haunting a mysterious old mirror--and why.