A five-hundred-foot wall of water. Tens of millions dead. Only one man can stop it.

When the U.S. Ambassador to the Philippines is abducted in Manila, elite operative Travis Delta is sent to rescue him.

As he battles through the jungle, Delta uncovers something far worse than a kidnapping—a doomsday cult with three stolen nuclear warheads and a plan to trigger a megatsunami that will obliterate America's East Coast.

Racing from the jungles of the Philippines to the Atlantic Ocean, Delta must hunt down the weapons before the cult's mad prophet can unleash a terrifying wave of destruction. But with a kidnapped nuclear physicist forced to arm the bombs, and a countdown ticking toward catastrophe, Delta is running out of time.

Meanwhile, all along the Eastern Seaboard, millions of innocent people go about their business. Never suspecting that only one man stands between them and certain death.

Chain Reaction – book 4 in the stunning action series featuring ex-Navy SEAL, Travis Delta. Perfect for fans of Lee Child, Jason Kasper & David Archer.