This Man Is Dangerous is a 1936 thriller novel by the British writer Peter Cheyney.

[1] It is the first in his series of ten novels featuring the FBI agent Lemmy Caution.

A bestseller, it enabled Cheyney to leave his job as a policeman and become a full-time novelist.

In 1953 it was made into a French film of the same title directed by Jean Sacha and starring Eddie Constantine as Caution along with Colette Deréal, Grégoire Aslan and Claude Borelli.

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