A best-selling author of novels, short stories, magazine articles, translations, and plays, Oppenheim published over 150 books. He is considered one of the originators of the thriller genre, his novels also range from spy thrillers to romance, but all have an undertone of intrigue. He also wrote under the name of Anthony Partridge. The book begins: Down with the traitors! Down with the Russian spies! Down with Metzger! Above the roaring of the north wind rose the clamor of voices, the cries of hate and disgust, the deep groaning sobs of fierce and militant anger. The man and the woman exchanged quick glances.