In Left of Karl Marx, Carole Boyce Davies assesses the activism, writing, and legacy of Claudia Jones (1915-1964), a pioneering Afro-Caribbean radical intellectual, dedicated communist, and feminist. Jones is buried in London's Highgate Cemetery, to the left of Karl Marx - a location that Boyce Davies finds fitting given how Jones expanded Marxism-Leninism to incorporate gender and race in her political critique and activism.

Claudia Cumberbatch Jones was born in Trinidad. In 1924, she moved to New York, where she lived for the next 30 years. She was active in the Communist Party from her early 20s onward. A talented writer and speaker, she traveled throughout the United States lecturing and organizing. In the early 1950s, she wrote a well-known column, "Half the World", for the Daily Worker. As the US government intensified its efforts to prosecute communists, Jones was arrested several times. She served nearly a year in a US prison before being deported and given asylum by Great Britain in 1955.

Looking at the contents of the FBI file on Jones, Boyce Davies contrasts Jones' own narration of her life with the federal government's. Left of Karl Marx establishes Jones as a significant figure within Caribbean intellectual traditions, Black US feminism, and the history of communism.