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.