Ironbark is a Cold War thriller done right. This true-story espionage tale was executed on an independent film’s budget, but you wouldn’t know it by looking at the screen. Thrills, human drama, and moments of humor abound as the true story of two individuals—one a British civilian and one a decorated Soviet Colonel—helped keep the world from the brink of nuclear war. Director Dominic Cooke understands exactly what makes a page-turning thriller like this tick, but doesn’t sacrifice the human stories at its core. The result is a wildly entertaining and inspiring—if …