When a young girl is found brutally murdered in London's Clapham Common, determined Metropolitan DCI Elizabeth Grainger finds herself thrust into an investigation that spans two continents. While attempting to track down the vicious killer, Grainger struggles to cope with her disordered home life, and things soon get even more complicated when Khan, a tough, Delhi police inspector, arrives to assist in the investigation. Khan's indomitable methods prove too much for Grainger, and as the case spirals out of control, she begins to wonder if there is more to the enigmatic Sikh than meets the eye.