4To Trust in What We Cannot See is the first book in Dennis Mansfield's series of time-traveling, historical thrillers. The story builds a genre-bending, thought provoking plot around a little known historical fact: During the month of January 1913, Adolf Hitler, Joseph Stalin, Vladimir Lenin, Leon Trotsky, and Josip Tito all lived in Vienna, Austria, near each other, and all regularly frequented the same coffee shop, Cafe Central. At the time, these five young men did not know one another-although some of them may have faced off in games of chess. This historical science fiction epic travels across space-time dimensions in an effort to prevent past horrors-in particular, the rise of the Nazi party and the Holocaust. Yet, a calculated act of murder to change the past winds up having an earth-shattering impact on the future.