This often hilarious 3-D thriller stars Bancroft as a trapeze artist at an amusement park, where the top attraction is a ferocious gorilla. After several murders take place, the main suspect is Mitchell, a law student working at the park as a costumed gorilla. Also suspect is Bancroft's
husband, park owner Burr. Another murder then takes place, and this time it's the gorilla who is suspected. As it turns out, the real killer is Bancroft. The suspenseful climax sees the real gorilla carry her to the top of a roller coaster before he is shot down. The excellent cast somehow pulls
it off, cheap gorilla suits and all.