A generation ago a young woman was knocked off her bicycle in the snow and left to die alone. Decades later, the murders start...

The first victim is a semi-disabled couple who are brutally ambushed and killed in their home. Others follow, each killing more horrendous than the last…

And in all the attacks, a calling card is left, a final indignity that suggests that revenge and retribution are at the heart of the brutal murders.

Newly promoted Detective Inspector Bulmer, Chief Inspector Robert Calderwood, and their friends and colleagues have a particularly chilling mystery on their hands, and it is up to them to find out the link between the deaths and to stop the killer once and for all – before yet more blood is spilt.