Hunting killers is Mason's job. But falling for a vampire is the scariest thing he's ever done.

Detective Inspector Mason Walker is good at his job. He has never focused on much else in his life. Women come and go. Friends take time he doesn't have to spare. The job is constant. He works hard and has built a reputation for determination and integrity.

Now his skills are needed more than ever. The level of violence in York has risen, involving both the haemophile and human communities. These are unexplored waters for Mason, with both political and professional implications, and Mason is afraid to lose his way.

But there's been a murder-a haemophile-and Mason's facing the question of not only who committed the dreadful crime but how? Nothing seems to be adding up. And being assigned a haemophile partner, Special Officer Cai Bracken, a freelance detective working for the Met Police, only increases his tension.

What's really unnerving is that Cai is not only making Mason question his professional convictions, but his personal preferences, too...his most personal preferences.

With so much at stake, can Mason really cope with overhauling his police work and his personal life all at once?