A violent attacker is on the loose. His calling card: a tattoo on his victims' skin. With no witnesses and no evidence left at the crime scenes, it will take all of the National Crime Agency's resources to track him down.

At the head of the investigation, codenamed Operation Juniper, Senior Investigator Joanne Stuart knows that the clock is ticking. The time between abductions is decreasing and the perpetrator grows ever more brazen. She fears it won't be long before his assaults turn deadly.

As the hunt closes in, Jo's already troubled personal life is put under further...