Fans of Peter Ritchie’s crime novels are in for a treat this week with the latest in the Grace Macallan series, ‘Evidence of Death’ out tonight. Billy Nelson is back home in battle-scarred Belfast. But the Troubles have cut this ex-Army Loyalist hard man deep – and now that his city’s allegiances have shifted, nothing is quite the same. An outbreak of gang violence forces Billy to move on. This time to Edinburgh, where he muscles in on the capital’s drug trade and the family who run it.