The Age of Reinvention by Karine Tuil

An international bestseller and finalist for the Prix Goncourt, France's most prestigious literary award, "The Age of Reinvention "is a suspenseful Gatsbian tale of a famous New York lawyer whose charmed and glamorous life is a sham.
Top Manhattan criminal defense attorney Sam Tahar seems to have it all: fame, fortune, an enviable marriage to a prominent socialite, and two wonderful children. But his success is built on a lie--he isn't the person he pretends to be.
Growing up a poor Tunisian immigrant, crammed inside the walls of a grimy Paris apartment tower, Samir Tahar seemed destined for life as either a drug dealer or a delivery man--until he decided "he was going to cut through the bars of his social jail cell, even if he had to do it with his teeth." At law school in Montpelier, France, he became fast friends with Jewish student Samuel Baron. The two were inseparable until the irresistible Nina, torn between the men, ultimately chose Samuel. Samir fled to America, where he assumed Samuel's identity and background while his former friend remained stuck in a French suburb, a failed, neurotic writer seething at Samir's overseas triumphs.
Decades later, the three meet again in this dark, powerful story of a deeply tangled love triangle that becomes subsumed by the war on terror. Called "a masterful novel...unquestionably one of the season's best" ("Paris Match") and "a work of great magnitude" ("Le Figaro"), "The Age of Reinvention "is an intriguing tale about the wonderful possibilities and terrible costs of remaking oneself.