India, 1919. Captain Sam Wyndham, former Scotland Yard detective, is a new arrival to Calcutta. Desperately seeking a fresh start after his experiences during the Great War, Wyndham has been recruited to head up a new post in the police force. But with barely a moment to acclimatise to his new life or to deal with the ghosts which still haunt him, Wyndham is caught up in a murder investigation that will take him into the dark underbelly of the British Raj. A senior official has been murdered, and a note left in his mouth warns the British to quit India - or else.