Among his most famous novels are:
* Agent Y
* The Lady and her Agent
* The Lady and the Spy
* The Big Killing
* Operation Death Trap
* The Dead End (with Walter Appel as T. R. Garrett)
* The Devil's Ticket (with Walter Appel as R. T. Garrett)
* The Big Grab (with Walter Appel as T. R. Garrett)
* Lady, Look Back (with Walter Appel as R. T. Garrett)
* Murder Goes Shopping (with Walter Appel as R. T. Garrett)
* Night of the Assassins (with Walter Appel as R. T. Garrett)
* Rendezvous in Darkness (with Walter Appel as R. T. Garrett)
* Agent Y at Bay
* Der letzte Akt (with Robert Artner as Robert Arlt)
* Spionin der Wüste (with Robert Artner as Robert Arlt)
* Die Lady und ihr Agent (with Robert Artner as Robert Arlt)
* Der Mann im Hintergrund (with Robert Artner as Robert Arlt)
* Die Lady und der Spion (with Robert Artner as Robert Arlt)
* Die Lady und das grosse Spiel (with Robert Artner as Robert Arlt)
* Die Lady und die Mafia (with Robert Artner as Robert Arlt)
* Der Mann und sein Schatten (with Robert Artner as Robert Arlt)
* Die Lady und das Syndikat (with Robert Artner as Robert Arlt)
* Die Lady und die Unterwelt (with Robert Artner as Robert Arlt)
* Die Lady und der KGB (with Robert Artner as Robert Arlt)
* Der Mann und das Spiel (with Robert Artner as Robert Arlt)
* Die Lady und der Boss (with Robert Artner as Robert Arlt)
* Der Mann und die Organisation (with Robert Artner as Robert Arlt)
* Die Lady und die CIA (with Robert Artner as Robert Arlt)
* Der Mann und die Mission (with Robert Artner as Robert Arlt)
* Der Mann und das Phantom (with Robert Artner as Robert Arlt)
* Die Lady und der Killer (with Robert Artner as Robert Arlt)
* Der Mann und der Tod (with Robert Artner as Robert Arlt)
* Die Lady und der Terrorist (with Robert Artner as Robert Arlt)
* Der Mann und die Intrige (with Robert Artner as Robert Arlt)
* Die Lady und der Spion (with Robert Artner as Robert Arlt)
* Der Mann und das Geheimnis (with Robert Artner as Robert Arlt)
* Die Lady und der Verräter (with Robert Artner as Robert Arlt)
* Der Mann und die Macht (with Robert Artner as Robert Arlt)
* Die Lady und der Mord (with Robert Artner as Robert Arlt)
* Der Mann und die Frau (with Robert Artner as Robert Arlt)
* Die Lady und der Feind (with Robert Artner as Robert Arlt)
* Der Mann und die Rache (with Robert Artner as Robert Arlt)
* Die Lady und der Schatten (with Robert Artner as Robert Arlt)
* Der Mann und die Liebe (with Robert Artner as Robert Arlt)
* Die Lady und das Abenteuer (with Robert Artner as Robert Arlt)
* Der Mann und das Risiko (with Robert Artner as Robert Arlt)
* Die Lady und die Gefahr (with Robert Artner as Robert Arlt)
* Der Mann und der Auftrag (with Robert Artner as Robert Arlt)
* Die Lady und das Komplott (with Robert Artner as Robert Arlt)
* Der Mann und die Falle (with Robert Artner as Robert Arlt)
* Die Lady und der Albtraum (with Robert Artner as Robert Arlt)
* Der Mann und der Verrat (with Robert Artner as Robert Arlt)
* Die Lady und die Verschwörung (with Robert Artner as Robert Arlt)
* Der Mann und die Zukunft (with Robert Artner as Robert Arlt)