They erased their memories, rewrote their names, and made them beasts. Now, the hunt for vengeance begins. Chief Aiken Oakley and Chief Styles Sawyer—two of the US Navy's most elite Special Warfare Combatant-craft officers—vanished after their mission was ambushed in South America and later presumed MIA. Captured by the Raven's organization, a covert assassin program, Oakley and Sawyer are stripped of their past, their memories, and even their names. They are subjected to inhumane experimentation and injected with predator DNA that transform them into primal, lethal weapons . . . and are now known only as Valor and Zorion.

After breaking free from the program's control, Valor and Zorion train themselves to master the beasts within them—pushing their minds, bodies, and instincts to the edge. But to take down the corrupt organization, they'll need more than strength, fury, and an appetite for revenge. They'll have to form uneasy alliances with the two other deadly Raven units—the strategic, silent Browns, and the ruthless, unpredictable Blacks. Together, these assassins must unite against the program that created them . . . and destroy it before it creates something worse. Black, Brown, and Green Ravens . . . The organization turned them into weapons, and now they've come back for war.

Contains mature themes.