DS Kat Ballantyne is still reeling from a revelation that turned life as she knew it upside down. But when a dog walker discovers the body of a woman among the standing stones known locally as the Three Sisters, there's no time to focus on her own troubles. Kat is drawn back to work to investigate. At first, the death appears to be an accident. But then Kat discovers an infinity symbol branded onto the dead woman's abdomen. She's convinced there's...