Inspector Thomas Pitt is called to a shocking murder scene. The dead man lies in a battered punt drifting on the Thames, his arms and legs chained to the sides of the boat. He is clad in a torn green gown. Flowers bestrew his battered body. Pitt's determined search for answers leads him deep into London's bohemia and into studios where masters of light and shadow are experimenting with the fascinating new art of photography. And as always, his pursuit is relentless...