The Assassination Bureau, Ltd is a thriller novel, begun by Jack London and finished after his death by Robert L.

The plot follows Ivan Dragomiloff, who, in a twist of fate, finds himself pitted against the secret assassination agency he founded.

The novel was based on a story idea London purchased from author Sinclair Lewis in early 1910.

London wrote 20,000 words of the novel before he gave it up later that same year, saying he could not find a logical way to conclude it.

Directed by Basil Dearden, the film was nominated for a Golden Globe Award in 1970 for Best English-Language Foreign Film, and Rigg was nominated for a Golden Laurel Award in 1970 for Female New Face.