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When fighter pilot Cal "Spectre" Martin is recruited by an unacknowledged government organization named Project Archangel, he believes the demons of his past have finally been laid to rest. But when a top-secret mission to secure chemical weapons in Syria goes horribly wrong, Spectre finds himself thrust back into civilian life. Within days of his forced retirement, an unknown agent attempts to assassinate Spectre and his friends. Although Spectre escapes the assassination attempt, one of his friends is killed, and Spectre's world is shattered by the loss.

General Bob Underwood - a special presidential envoy for the Global Coalition to Counter ISIL - is en route to the Syrian city of al-Bukamal when a rocket-propelled grenade strikes the side of his Humvee, and the heavily armored convoy comes under attack. The general's bodyguard is brutally murdered, and Underwood himself is kidnapped. Hours later the president and top officials watch in horror from the Oval Office as the general is viciously beheaded by an ISIL leader - broadcast on live television through a direct feed from Al Jazeera.

John Dempsey's life - as an elite Tier One Navy SEAL named Jack Kemper - is over. A devastating terrorist action catapults him from a world of moral certainty and decisive orders into the shadowy realm of espionage, where ambiguity is the only rule. His new mission: hunt down those responsible for the greatest tragedy in the history of the US Special Ops and bring them to justice.

North Korea has achieved a breakthrough with nuclear warheads and is about to arm their strategic missiles - weapons that could set the world ablaze. The Echo Six unit commander, Abe Talley, is ordered to take his men across the 38th Parallel. Their mission is to locate and destroy the nukes, as well as their creators. They must enter the heart of the most secretive, repressive, and brutal nation on Earth - and somehow find a way back.

They are an international elite unit created by NATO to carry out missions where no other could hope to succeed. A mix of Seals, Delta Force, British SAS and French, German and Polish SpecOps operators. Led by a former Navy Seal, Lieutenant Abe Talley. This is Echo Six. Even before they finish training a crisis develops that requires their unique and bloody brand of soldiering.