Rather Be the Devil (#21 Inspector Rebus)

Ian Rankin

Rebus investigates a cold case that just turned red hot. As he settles into an uneasy retirement, Rebus has given up his favorite vices. There's just one habit he can't shake: he can't let go of an unsolved case. It's the only pastime he has left, and up until now, it's the only one that wasn't threaten...