Gemma James races the clock to save the life of a young child, while Scotland Yard detective Duncan Kincaid is faced with the ultimate challenge: find the traitor in his ranks. As Gemma begins to see a solution to her case, Kincaid has to ask himself if he can rely on his friends, both inside and outside the Scotland Yard force, to stand beside him as he faces the deadliest challenge of his career. New York Times bestselling series.