A routine trip to New York turns perilous when ex-operative Tom Keen is recruited by a mercenary chief to help rescue a kidnapped CIA agent.

The Halcyon team scrambles to rescue Scottie's close family friend after he's falsely arrested for espionage in a dangerous foreign country.

A plane crash in the Ural Mountains sends Tom and Nez to Russia on a covert operation to infiltrate a mysterious, top-secret military facility....

When ruthless terrorists escape from a "black site'' prison in Manhattan, Tom and the Halycon team must lock down the city and find the terrorists...

Tom and Mr. Solomon go under cover on an international flight that they believe will be hijacked by a ring of ruthless thieves who steal classified...

When a wealthy businessman, his wife and young son are abducted by professional kidnappers, the Halcyon team is tasked to get the family back. But...

Tensions escalate between Scottie and Howard forcing Tom to reach out to an unexpected ally for help. As explosive family secrets come to light, Tom...

In the explosive season finale, Scottie and Howard battle for control of Halcyon and the dangerous technology tied to Whitehall. Tom clashes with Mr....