One of a series of second feature films based on Edgar Wallace novels, released between 1960 and 1965 in British cinemas. The films were later sold to American TV and screened there as The Edgar Wallace Mystery Theatre (1959).
The book being read by Fisher, "Mystery of Tunnel 51", was written by Alexander Wilson (original published in 1928). It was the first of the "Wallace of the Secret Service" series.
The film's leading man,Bernard Lee would reprise his role into another "Edgar Wallace Mysteries" film two years later.
Christine Shaw's debut.
Opening credits: All characters and events in this film are fictitious and any similarity to actual persons and events is purely coincidental.