While pursuing a prostitute whose johns keep winding up dead, newspaper reporter Cass Green and photographer Hugh McNeill uncover a nest of intrigue. A young lawyer’s suicide, activities of the German American Bund, and a Stalinist eliminating Trotskyite traitors are just a few of the stories they pursue through the streets of 1937 New York. “The Dark Heart of Night” is the third mystery novel from Vincent McCaffrey. “Hound,” McCaffrey’s debut novel, was declared a Must-Read Book by the Massachusetts Book Awards.? $1.99 on Kindle.