When Robert and Clara Jordon are robbed of more than a million
dollars worth of jewels, Nancy goes undercover as a member
of a traveling carnival to prove the innocence of a young
man with a police record. The Jordon's are certain that Henry
Salazar is the thief, but Nancy and her father, lawyer Carson
Drew, are sure that the now reformed criminal isn't guilty.
Nancy joins the carnival to gather clues to find the real
robber, and finds more than she bargained for in the after
hours of the shadowy midway.