Snake catcher Simon Keys and his girlfriend, Siouxsie Gillett, receive a call when a huge snake is spotted in the swimming pool of a country club. When they arrive, they spot the snake curled up in the shallow end, and it's one of the biggest black mambas they have ever seen. Simon and Siouxsie jump into the pool to catch it, but it is so large and powerful that they struggle to pin it down.