The Blood Detective

It's not the best start to DCI Grant Foster's day:  standing over a mutilated body in a windswept London churchyard.  Although the killer has left a cryptic and brutal clue.

It is only when the clue is handed to Nigel Barnes, a specialist in compiling family trees, that the full message becomes spine-chillingly clear.  For it leads Barnes back more than one hundred years - to the victim of a demented Victorian serial killer.