The past comes back to haunt them.

Twenty-five years ago, a schoolgirl was attacked. Ambushed by three bullies at her home where she lived alone with her granny.

Now, the mother of one of those bullies is found murdered on the Hobfield housing estate. Written on the wall in the victim’s blood is the word ‘sorry’.

Detectives Calladine and Bayliss discover a link to some bones found at an old house up in the hills. It was the home of the teenage girl who was attacked.

The detectives have more than this puzzling case on their hands. Arch-villain Lazarov is threatening Calladine’s granddaughter and a valuable hoard of Celtic gold is coming to a local museum.

The pressure is on, and this time Calladine is cracking . . .