One last mystery holds the key to saving the world, and Grace must choose how she spends her final days.

Desperate to defuse a nuclear standoff, Liam receives help from an unlikely source. Also, with Darius missing, Harris and Grace take matters into their own hands.

A stand-off at the COPE compound leads to tragic results

Grace forges a dangerous alliance with Claire’s brother, Alonzo. Also, Harris and Darius must work together to face down Bennett’s forces

Darius, Grace and Harris uncover the darkest secret yet, and Liam reconnects with Jillian.

After a nuclear incident, the secret of the asteroid becomes public, setting the world on a dangerous course. Darius, Grace, Liam and Harris must adapt to new roles in an ever-shifting landscape of fear and civil unrest.

Darius and Grace’s relationship is tested, and President Mackenzie attempts to bring the fractured country together while the hacktivist group ReSyst issues a deadly edict.

Darius forms a dangerous alliance in order to destroy the dark money forces of Q17. Also, Grace takes action when surprising news jolts her world.

The government’s final plans for a doomsday scenario set in motion a surprising chain of events for Grace, Darius and Harris.

Grace embarks on a dangerous mission, and Liam and Darius’ relationship is tested.

Darius and Grace must forge an emotional détente to get international cooperation. Liam meets a new scientist who has a mysterious past.

Darius vows revenge on the hacktivist group ReSyst, no matter what the cost. Also, Harris discovers a dark secret and Grace reveals one of her own.

Grace is asked to lie under oath. Darius tasks Liam with a dangerous mission. A shocking act of violence plunges the nation into chaos.