The explosive conclusion to The Marine Raider Trilogy! "I love action and Harrison's books have it and then some. Very enjoyable reads." - SGM (R) Kyle Lamb, Author of Leadership in the Shadows, President of Viking Tactics, Delta Force In the Heart of Darkness, Marine Raiders David Shaw and John Wyatt fight to survive in hellish captivity, forced to mine raw cobalt with their bare hands while suffering the violent attention of Gao Zan, the mine’s diabolical overseer. But finding an impossible ally, the two Raiders learn the secrets behind The Czar’s personal prison in which they labor and the unlimited global reach of his criminal cabal. Refusing to give up on Shaw and Wyatt, Natalie Hale embarks on a relentless mission to rescue the two lost Marines. Leveraging allies from conflicting circles and walking a sharp line between right and wrong, the compulsion to save those dear to her just might drive her to the grave. From the Congo to Malta, from Switzerland to the Baltic Sea, David Shaw and Natalie Hale trudge through the malignant underworld of the global, aristocratic elite to eliminate the menace that inexcusably targets family. As bullets fly and blood pools, Shaw and Natalie realize their training only goes so far and that this game has different rules. One fact becomes clear. No one is safe…