Careless in Red (Inspector Lynley)

the long version

Scotland Yard’s Thomas Lynley returns to investigate what may be a perfect crime. On a lonely stretch of coastline, Lynley discovers the body of a young man. Thus begins a quest to unmask a clever and ruthless murderer. But this time, Lynley’s not in charge. He’s a witness—and possibly even a suspect. The local detective leading the investigation soon figures out that Lynley can help. So can his former associate Barbara Havers, whom Scotland Yard sends to Cornwall, ostensibly to assist in the investigation, but unofficially to check up on Lynley and possibly win him back to the Yard.