Undercover operative Tom Keen sets off on a new path after a mysterious meeting with the father he never knew leads him to join Grey Matters, a covert international security organisation run by his biological mother.
EPISODE 1
1. Leland Bray
Ex-operative Tom Keen is recruited by the head of an international security firm to help rescue a kidnapped CIA agent; in the course of the mission, Tom discovers evidence of a conspiracy within his own family.
EPISODE 2
2. Kevin Jensen
When an American journalist and close family friend of Scottie is falsely arrested for espionage in a dangerous foreign country, the Halcyon team mounts a last-ditch effort to rescue him before time runs out.
EPISODE 3
3. Independence, USA
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; Scottie enlists Mr. Solomon to find answers about her husband.
EPISODE 4
4. Operational Davenport
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.
EPISODE 5
5. Borealis 301
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 material; Howard urges Tom to find proof of a conspiracy orchestrated by Scottie.
EPISODE 6
6. Hostages
The Halcyon team must make a dangerous choice when professional kidnappers abduct a wealthy businessman and his family.
Famke Janssen
Ryan Eggold
Edi Gathegi
Tawny Cypress
Adrian Martinez
Theodora Miranne
Jon Bokenkamp
John Eisendrath
John Fox
John Davis
David Amann
