Noted British horror director Freddie Francis and author Robert Bloch, who wrote Psycho, combine their talents for this tale of terror. Pop singer Vicki Robbins (Suzanna Leigh) collapses from exhaustion and takes a vacation on a small resort island. She soon meets Mr. Hargrove (Guy Doleman), a difficult man with a failing marriage who owns the resort and keeps bees as a hobby. However, when Hargrove's wife dies from bee stings, Vicki discovers that someone on the island is breeding a strain of killer bees, and she has to find out who is responsible and what can be done before they kill again.