He grew up in the bookstore of his bookseller and libertarian father, rue de Tolbiac in the 13th arrondissement of Paris, 

where he read many novels and short stories. From the age of 16, Marxism became the ideological landmark of his life. In 1968, won over to left-wing ideas, he campaigned for the Gauche prolétarienne, worked in various odd jobs and, from May 1968, wanted to become the first activist “committed” to writing noir novels.

He publishes his first black novel cop killers, in August 1979. In this very free adaptation of the Oresteia, a myth from ancient Greece, a commissioner is in charge of an investigation which should allow him "to arrest killers who like to cut up his colleagues". This first novel is part of the new literary genre of neo-polar. 

He was hailed, from that time, by the critics Max-Pol Fouchet and Alain Dugrand.

From the mid-1980s, he wrote screenplays for the cinema and at the same time began to publish more classic novels, while continuing his work in the noir novel. 

Averse to labels and ghettos, he did not appreciate Mitterrand's socialism, against which he wrote, in 1993, Chronicle of a political liquidation.

For Fajardie, thrillers and thrillers are the best ways to explore the upside and downsides of contemporary society. In his work, where the chivalrous spirit of his characters is opposed to contemporary mediocrity, his political leftism is combined with the values ​​of honor, fidelity and often fraternization beyond ideological or historical oppositions.

His works, in the versions published by NÉO editions (later taken over by La Table ronde), have covers designed by Jean-Claude Claeys. They marvelously restore the dark urban atmosphere, the violence and the disillusion that mingle in Fajardie's work.

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the first on the title page: "A Francine" in capitals, mention surrounded by a circle in pen and opposite the names of the two initial dedicatees crossed out, and the second at the end of the volume: "summer 1982"

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