On a deserted London street late one evening in 1980, a beautiful young woman is brutally killed. When Detective Smallbone is called to the scene he learns that the victim is a model, but otherwise his, investigation proves fruitless. The killer left no clues and what's more no one seems to know who the victim really was. But just as the pressure on Smallbone is at its height, the case takes a surprising twist . . .
Away from the crimes of the city, a young autistic boy called Kit is living alone with his mother. Things are difficult at home: men come and go; his mother is secretive, they keep moving house. For Kit the world is unfriendly and strange.
Many years late Kit comes to London, trying to make sense of himself and searching for some answers. His quest leads him to an aging Detective Smallbone - and the 1980 case of a murdered model . . .