1949. An unsigned letter arrives on the desk of Chief Inspector Derry of the Canterbury police. Enclosed is a jade pendant, identical to the one that went missing from the body of Portia Blake, an actress murdered a decade previously. The case had been shut quickly at the time – the accused vagrant gave a written confession and was sentenced to the gallows – but in the police s haste to close the inquiry, the necklace was never recovered. Until now.

Inspector Madden is asked to investigate the letter s worrying claims by his old friend, and former Chief Inspector, Angus Sinclair, who fears the wrong man may have been hanged on his watch. But with a world war separating Madden from the murder, the truth will not come easy . . .