Matt Charman follows 'Treason' with another five-part London-set show, this one tracking a high-stakes summit between the British prime minister and the French president.

James Cosmo, 77, is a Scottish character actor who has appeared in films, including Trainspotting, The Chronicles of Narnia: The Lion, the Witch, and the Wardrobe, Ben-Hur, and Wonder Woman. His TV work includes Game of Thrones, Sons of Anarchy, His Dark Materials, and Jack Ryan.

This impossible dilemma is at the center of Hostage, a gripping Netflix limited series that follows a prime minister (played by Suranne Jones) who is torn between renouncing her post and saving her husband from the rebels who kidnapped him.