
A professor teaching at a correspondence school discovers that a Nazi agent is trying to prevent a trade treaty being signed between England and South America.

as Prof. Davis

as Bobby Jessop

as Costello

as Crabtree

as Joyce

as Prof. Davys

as Harman

as Innsbach

as Sir John

as Onslowe

as Matron

as Sister Spooner

as B.B.C. Interviewer

as Male Nurse

as Station Master

as Ticket Collector

as Sister at Nursing Home

as Hotel Receptionist

as B.B.C. Producer

as Hospital Nurse

as Butcher's Boy

as Miss Rudge

as Journalist

as Train Passenger

as Mrs. Webster

as Ministry Receptionist

as Nurse

as Porter