Night of fear (1986)

Steve is a zoologist who does research on poisonous snakes with the help of his friend Thabo. He and his wife Katrien are newly weds and very much in love but Steve's dangerous occupation casts a shadow over Katrien's happiness and causes tension between them. Sonja, an aspiring artist and Katrien's best friend, visits the couple and seeks inspiration for her paintings. She becomes aware of sinister undercurrents and a series of strange murders start feeding her anxiety. Will an unexpected discovery seal her fate?