Spring is a magical time in England - bluebells massing along the woodland paths, primrose and wild thyme dotting the meadows. Antiques dealer Kate Hamilton is spending the month of May in the Suffolk village of Long Barston, enjoying precious time with Detective Inspector Tom Mallory. While attending the May Fair, the annual pageant based on a well-known Anglo-Saxon folktale, a body turns up in the middle of the festivities.
Kate is even more shocked when she learns the murder took place in antiquity shop owner Ivor Tweedy's stockroom and a valuable Chinese pottery jar that she had been tasked with finding a buyer for has been stolen. Ivor may be ruined. Insurance won't cover a fraction of the loss.
As Tom leads the investigation, Kate begins to see puzzling parallels between the murder and local legends. The more she learns, the more convinced she is that the solution to both crimes lies in the misty depths of Anglo-Saxon history and a generations-old pattern of betrayal. It's up to Kate to unravel this Celtic knot of lies and deception to save Ivor's business.