I read this 1967 paperback along with The Hardy Boys during a period in my childhood when I was reading everything I could get my hands on. James Dark was a pseudonym for Australian author James Edward Macdonnell. He is best known as the author of numerous Naval military thrillers. The Mark Hood character debuted during a time when Sean Connery’s James Bond films were raking in millions. The great spy craze had begun and the paperback market was flooded with characters inspired by Ian Fleming’s secret agent. Hood works for Intertrust, a top secret inter-power nuclear security organization. Headquartered in Geneva, Switzerland, Intertrust sends agent Mark Hood to Jamaica with Tommy Tremayne who poses as Charles Battersby. The subterfuge is intended to provide the real Charles Battersby, a specialist in high energy physics, a chance to vacation incognito and bask in some much needed rest. Naturally things go wrong fast, and the matter is complicated by a dish named Marcia Borja. The action is masculine, perfunctory and not without its charm. I don’t know precisely how many Mark Hood adventures Macdonnell wrote, but I do recall reading several others. Operation Scuba features advertisements for Assignment Tokyo, The Bamboo Bomb, Come Die with Me and Hong Kong Incident. Ultimately, Operation Scuba is enjoyable on its own terms. It’s neither the best nor worst of the espionage paperbacks inspired by Ian Fleming’s James Bond novels.