As a Secret Service agent, Nick Averose spent a decade protecting the most powerful men and women in America and developed a unique gift: the ability to think like an assassin. Now, he uses that skill in a little-known but crucial job. As a "red teamer", he poses as a threat, testing the security around our highest officials to find vulnerabilities - before our enemies can. He is a mock killer, capable of slipping past even the best defenses.

US Marshal Arliss Cutter is a born tracker. Raised in the swamplands of Florida, he honed his skills in the military, fought in the Middle East, and worked three field positions for Marshal Services. When it comes to tracking someone down - or taking someone out - Cutter's the best. But his newest assignment is taking him out of his comfort zone to southeast Alaska. Cold, dark, uninhabited forests that are often shrouded in fog. And it's the kind of case that makes his blood run cold.

For years CIA officer Sam Hudson has been hunting Konstantin, a Russian deep cover operative responsible for a string of assassinations in the West—and he believes a well-placed source in Geneva can finally get him close to the killer. But when their meeting is ambushed, Sam's partner is murdered and he barely makes it out alive himself. Back in the States, the bosses put him on leave. When Sam gets a mysterious call at the Lincoln Memorial just before a bomb goes off, he realizes Konstantin has followed him to the U.S.—and is targeting him and everyone close to him.

Drafted against her will to become a "Sparrow" - a trained seductress in the service, Russian intelligence officer Dominika Egorova is assigned to operate against Nathaniel Nash, a first-tour CIA officer who handles the CIA's most sensitive penetration of Russian intelligence. The two young intelligence officers, trained in their respective spy schools, collide in a charged atmosphere of tradecraft, deception, and inevitably, a forbidden spiral of carnal attraction that threatens their careers and the security of America's valuable mole in Moscow.

The day that every secret service agent trains for has arrived. The White House has been breached; the President forced to flee to a massive doomsday bunker outside DC to defend against whatever comes next. Only the most trusted agents and officials are allowed in with him—those dedicated to keeping the government intact at all costs. Among these is Erik Hill, who has given his life to the Secret Service. They are his purpose and his family, and his impressive record has made him a hero among them.