Peter Cushing took time off from his Frankenstein and Dracula duties to star in the standard-issue melodrama Fear in the Night. Cushing plays Michael Carmichael, the headmaster of a private school, where Robert Heller (Ralph Bates) is engaged as an instructor. Heller also indulges in extracurricular activities of an amorous nature with Carmichael's wanton wife, Molly (Joan Collins). Teacher and errant wife plot to drive Heller's wife (Judy Geeson) insane and thus induce her to kill Carmichael, thereby removing all roadblocks to Molly's happiness.
~ Hal Erickson, All Movie Guide