Book 21

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

Book 26

Hitck Mys Headless Horse

by William Arden and Alfred Hitchcock

Published 12 September 1977
When three junior detectives search for a valuable old Spanish sword lost since the Mexican War, the headless statue of a horse yields a clue.

Book 28

The Three Investigators foil a plot to kidnap the son of a political leader in an African colony.