The Final Reckoning — Margaret James

A young woman returns home to the dangerous secrets she once escaped in this atmospheric British thriller from the acclaimed author of Girl in Red Velvet.
 
Everyone in the small English town of Hartley Cross knew that Lindsay Ellis and Simon Dyer were inseparable. But their teenage love was cut short by a horrifying crime. Lindsay stumbled across the brutally murdered body of Simon's father, Louis. Traumatized by the experience -- and by Simon's arrest -- Lindsay left Hartley Cross and never looked back. Until now.
 
With her mother's passing, it falls to Lindsay to plan the funeral and sort her mother's affairs. That means returning to Hartley Cross, and confronting the anguish that has haunted her for years. Many of Lindsay's old friends are still there. And so is Simon, who was eventually acquitted. After all these years, Lindsay's heart still jumps when she sees him. Perhaps there's hope for their spark to be rekindled. But not everyone is happy to have Lindsay back home. Because whoever killed Louis was never caught -- and may be willing to strike again in order to keep it that way.