Private detective John Duval, an ex-lieutenant commander in the Royal Navy and Naval Intelligence, finds himself the prime suspect in a police hunt for a sexual killer when three women are brutally murdered.

Sophie is snatched from her orphanage early one morning by the BFG (Big Friendly Giant), whom she witnesses engaged in mysterious activities. She is soon put at ease, as she learns that BFG’s job is to collect, catalog and deliver pleasant dreams to children. She joins him that night, but a mean giants follow them, planning to eat the children of the world.

When Arthur Davis, a junior bachelor in the British secret service’s African section, is seen taking a file with him to meet his girlfriend Cynthia- the brass fears he may be the leak to Moscow, and allows Dr. Percival to terminate the ‘risk factor’ by poisoning to avoid a scandal. In fact Davis’s desk chief, Maurice Castle, is the double agent since the South African communists helped him smuggle out his black lover Sarah M., meanwhile his wife and mother of schoolboy Sam, to force him to cooperate with the Apartheid government. When Cornelius Muller, the South African official who failed to get him in Pretoria’s power, visits London for the anti-communist operation Uncle Remus, he points out Castle still is the natural suspect