When a New York diamond dealer and his wife are found dead in a chilling assassination, and a mysterious gem--the Lucifer Cut--goes missing, U.S. Treasury agent Alex Turner and his lover, the billionaire Russian diamond thief known as Slav Lily, are thrust into a web of global intrigue. Uncertain they can even trust each other, the two find themselves on the trail of a secret so lethal it threatens not only the world diamond trade but the national security of the United States.

In a fiction first, diamond expert Matthew Hart tears the curtain from the secretive world of lab-grown diamonds, where master "chefs" create astonishing gems in the 8,000-degree furnaces of their reactors. Finally one of them makes what no one thought possible--a fake so perfect not even experts can unmask it. But as Alex and Lily soon discover, its allure is even more profound than its beauty as a jewel, and the stone ignites a murderous race from New York to London and finally to Cape Town, as a deadly enemy tries to beat them to the diamond.

With knife-sharp dialogue and lacerating irony, Alex and Lily navigate an ever-shifting underworld and the storms of their own desire as they rush to unravel the enigma of the Lucifer Cut and the treacheries of the human heart.