Two men try to convince themselves they've committed the perfect murder by hosting a dinner party after strangling a former classmate to death.
 
You'll get tied up with this one.
 
Hitchcock's Signature Cameo:  Alfred Hitchcock appears, though barely if at all recognizable, walking down the street during the opening credits at around 2 mins as one of two pedestrians walking up a sidewalk holding a newspaper. The neon sign advertises "Reduco", the same fictional weight-loss product that Hitchcock advertised in his famous newspaper ad cameo in Lifeboat (1944).
 
FUN FACT:  Since the filming times were so long, everybody on the set tried their best to avoid any mistakes. At one point in the movie, during the first take scene, the camera dolly accidentally ran over and broke a cameraman's foot, but to keep filming, he was gagged and dragged off the soundstage. Another time, a woman puts her glass down but misses the table. A stagehand had to rush up and catch it before the glass hit the ground. Both parts are used in the final cut.