The Distant Echo by Val McDermid

That night in the cemetery. The girl's body in the snow, her blood scarlet against the white ground...Four a. m. on a freezing Fife morning and four drunken students stumble upon the body of a woman lying in the snow. Rosie has been raped, stabbed and left for dead in an ancient Pictish cemetery. And the only suspects are the four young men now stained with her blood. Twenty-five years later the police mount a 'cold case' review of Rosie's unsolved murder and the four are still suspects. But when one of them dies in a suspicious house fire and another in a burglary gone bad, it seems that someone is pursuing their own brand of justice. For the remaining two there is only one way to avoid becoming the next victim -- find out who really killed Rosie all those years ago...