OWEN and Luna met as students at a liberal arts college in the Hudson Valley, New York, in The Accomplice by Lisa Lutz (Titan, £8.99), and despite or because of their obvious incompatibility became instant best friends for life. 

Years later, their relationship puzzles everyone who meets them. They’ve never been lovers; they seem somehow much closer than that. Though they’re both married to other people, their own alliance is clearly still the main one in their lives. 

Is this anyone else’s business? Well, it is if you’re a homicide detective and someone close to Luna and Owen has just died, and you learn that this isn’t the first time that’s happened.