The Sign of the Devil

The Devil Has Come to Edinburgh...
An ill-fated grave-robbery unearths a corpse with a most disturbing symbol on it. When a patient in Edinburgh's lunatic asylum is murdered, the same sign is daubed in blood on the walls - the mark of the devil.
The prime suspect: inmate Amy McGray, notorious for killing her parents years before. Her brother, Detective 'Nine-Nails' McGray, must prove her innocence - with the help of an old friend . . .
Inspector Ian Frey insists he is retired. But when called upon, he reluctantly agrees to their final case.
As twists follow bombshells, leading to secrets that have been waiting in the shadows all along, all will be revealed . . .
This rollicking Victorian sensationalist melodrama is the epic conclusion to the marvellous Frey & McGray mysteries.