Although Dido Elizabeth Belle, an eighteenth-century English woman of mixed race, is raised in privilege by her aristocratic great-uncle and his wife, she is denied a proper social standing because of her skin color. But when Dido falls in love with a young idealist lawyer who aspires to create positive change, she finds herself caught between two worlds.

When a terrorist escapes custody during a routine handover, Will Holloway must team with disgraced MI5 Intelligence Chief Harry Pearce to track him down before an imminent terrorist attack on London.