The bloated remains of a man are discovered bound to a derelict pier in Orkney and newly promoted DCI Lukas Mahler dispatches a team to investigate. But when the body is identified as Alex Fleming - Mahler's former colleague from his time in the Met - the case becomes personal. Mahler's investigation takes him from his old stamping ground of London to the world of organised crime, and from sixteenth-century witch executions to Fleming's most notorious...