Agent Sarah Black is back. She's determined to single-handedly foil the assassination of the President of Azerbaijan, and it's getting messy.

Other than that, she is disarmingly normal. A diminutive twenty-something fresh out of university, she's worried about her recently widowed father, trying to keep up with her high-flying friends, and jockeying with her attractive colleague to earn the approval of their boss. She also just happens to be a spy.

Recently recruited by 'Michael', the enigmatic head of an off-the-books espionage agency, she's keen to impress. But the glamour of private jets and fake identities quickly fades when she's thrown into a web of secrets stretching from London to North Korea via China and Georgia. With nothing but her sharp instincts for reading people, her gift for chess-playing, and an unexpected talent for hijacking trains, Sarah plunges into a relentless chase across continents in pursuit of the darkest of operators.

As the lines between ally and enemy blur, Sarah finds herself questioning the loyalty of her own team... just who is she working for, and is she a player, or merely a pawn?