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Peter O'Donnel
Peter O'Donnell was an English writer of mysteries and of comic strips, best known as the creator of Modesty Blaise, an action heroine/undercover trouble-shooter. He was also a gothic historical romance novelist who wrote under the female pseudonym Madeleine Brent; in 1978, his novel Merlin's Keep won the Romantic Novel of the Year Award of the Romantic Novelists' Association.
Excerpt from Wikipedia, available under CC BY-SA 4.0.
Books

Romeo Brown Tome 1
1983
ISBN 9782737652905
La Romeo Brown Volume 2 1961-1962
1984
ISBN 9782737652929