Rennie Airth's "River of Darkness" is an ambitious book. it wants to be a good psychological thriller while also being a good post World War I novel. Well, that fails. The psychology is sound, as the hero, John Madden, learns of what could be driving the killer. Madden is a haunted widower who is also scarred mentally from war. His love interest is also scarred in her own way, and she is also unconviningly forward with Madden. It seems so out of place. The history here is the best part. Airth does get the zeitgeist of 1920s Britain right. His characters, on the other hand, are flat and boring. The killer, who we meet early, is a one-trick pony. That really isn't interesting. Predictable maiden-in-distress as climax, and very predictable ending.