An insurance investigator tumbles onto a series of similar deaths, by brain hemorrhage, of patients of a psychiatric clinic in France where therapy involves a device which can implant visual imagery in the minds of patients, ostensibly to help them relax.

Rod Cameron
as Jeff Keenan

Mary Murphy
as Ruth Vance

Meredith Edwards
as Doctor Maxwell

Peter Illing
as Paul Zakon

Carl Jaffe
as Doctor Hoff

Kay Callard
as Laura Maxwell

Carl Duering
as Blore

Roberta Huby
as Verna Berteaux

Felix Felton
as Commissaire

Larry Cross
as Brad Somers