If only everything in life was as dependable as a Doug Johnstone novel. Over the years he has become a writer whose books you can open and relax into as you know you are in safe hands. Although, perhaps ‘relax’ isn’t the most appropriate word as Johnstone rarely lets you do that. A trademark of his novels is that he gets into the action quickly and keeps readers hooked until the final word, offering a literary joy ride each time. His latest, A Dark Matter, is no exception. It