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.

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 before disaster strikes.

In the explosive season finale, Scottie and Howard battle for control of Halcyon and the dangerous technology tied to Whitehall. Tom clashes with Mr. Solomon as he makes a fateful choice.