A young man is being blackmailed and needs to borrow the cash from his sister. She insists on meeting the blackmailer so travels to his remote country house; en route picking up a curious hitcher. They arrive and during the course of the night the blackmailer (Alexander Gauge) is murdered. Unusually, the lead female role - played here by Mary Germaine - has a much more substantial role in this mystery as they attempt to identify the murderer. William Sylvester plays the hitcher-cum-sleuth well and Denis Shaw is good as they nosey butler in this short-but-sweet double-crossing pot-boiler that doesn't hang about - it's pretty non-stop for 70-minutes.