Saison 1

Après avoir assisté à une conférence médicale à Pékin et avoir frôlé la mort dans un accident de voiture, le Dr Matthew Nolan rentre chez lui. Il est arrêté à l'aéroport londonien d'Heathrow. Épuisé et confus, Nolan est accusé du meurtre d'une femme qui se trouvait dans la voiture qu'il a accidentée.

As Nolan fears for his life, tensions rise on board; Hana is instructed to investigate by the head of MI5 Delaney; Hana's sister starts digging into the events occurring on NCA 357.

Nolan recounts the events in Beijing; Hana continues to investigate the events on board; Jess's findings lead her to a mysterious international medical company.

Jess fears for her life when she becomes a target for both MI5 and a deadly assassin; Delaney uncovers a shocking truth that changes her understanding of events that night.

The truth about events on board is revealed, forcing Hana to take drastic action; Tennant is put in charge of Delaney's operation, forcing Delaney to break protocol.

The events of the fateful night in Beijing are revealed. Hana and Delaney hatch a daring plan, risking their lives to bring those responsible for the conspiracy to justice.