The wife of a cruel headmaster and his mistress conspire to kill him, but after the murder is committed, his body disappears, and strange events begin to plague the two women.
A classic horror mystery melodrama that stills manages to thrill and shock; masterfully executed in all departments.
Halliwell***: "Highly influential, suspenseful and scary thriller with a much-copied twist typical of its authors. Slow to start and shabby-looking as befits its grubby school setting, it gathers momentum with the murder and turns the screw with fine professionalism."
Maltin***1/2: "Classic ciller builds slowly, surely to final quarter hour that will drive you right up the wall. A must."