Murder Madness [Illustrated]

Seven United States Secret Service men have disappeared in South America. Another is found-a screaming homicidal maniac. It is rumored that they are victims of a diabolical poison which produces "murder madness." Charley Bell, of the "Trade"-a secret service organization that does not officially exist-discovers that a sinister system of slavery is flourishing in South America, headed by a mysterious man known only as The Master. This slavery is accomplished by means of a poison which causes its victims to experience a horrible writhing of the hands, followed by a madness to do murder, two weeks after the poison is taken.