Rather Be the Devil by Ian Rankin
Detective Inspector John Rebus investigates a cold case that has turned red hot once again.
John Rebus, as incapable of settling into his retirement as he is of playing by the rules, investigates a cold case from the 1970s involving a gorgeous and wealthy female socialite who was found dead in a bedroom at one of Edinburgh’s most luxurious hotels. No one was ever found guilty, but the scandalous circumstances of the murder have kept the town talking for over forty years. Now, Rebus has his own reasons to investigate, but his inquiries quickly make him some very dangerous and powerful enemies who will stop at nothing to ensure that the case remains unsolved and the gossip falls on deaf ears.