He has always been the hunter. He is about to become the prey.

For years, DCI Robert Kett has tracked down the country’s most dangerous kidnappers and serial killers, earning a reputation as the best man to call to catch the bad guys.

The tables are about to turn.

When somebody starts brutally murdering the criminals that Kett has put behind bars—and the ones that he wasn’t able to catch—it seems as if there is a vigilante on the loose.

Tasked with keeping one of these criminals alive, Kett starts to understand that something far more dangerous is going on.

And the killer isn’t just coming after the bad guys. He’s coming after Kett, too.