Detective Garrison (Lee J. Cobb) is investigating a vicious murder that was committed at a theme park. Initially, the show gorilla Goliath appears to be to blame. As Garrison digs deeper, though, he begins to realize that many of the park's entertainers and staff members could be the culprit. Jealousy and deceit abound amongst the suspects, who include Goliath's keeper (Raymond Burr), a man who does a stage show dressed as a gorilla (Cameron Mitchell) and a trapeze performer (Anne Bancroft).