The Black Mariah by Jay R. Bonansinga
It all happened because John Rebus was in his favorite Edinburgh massage parlourreading the Bible...So opens the latest Rebus mystery and within a few pages the hapless Rebus has lost a lover, found an unwanted brother, been reacquaintedwith a dangerous ghost from the past, and witnessed the black comedy of life in a blood-soaked Edinburgh butcher's shop. Or as Rebus puts it, 'just one of thoses weeks'.