Starring Lukas Ammann and Wolfgang Völz, the series followed the adventures of the titular aristocratic gentleman detective and his working-class butler.
He wore a traditional suit and bowler hat, and carried an umbrella, similar to John Steed in the TV series The Avengers.
Although he lived in a castle in Bavaria (where, especially in the beginning, a great deal of the show was shot) he had no Bavarian accent and his appearance was as British as his Rolls-Royce.
Ioan applied his highly efficient close-combat techniques in a very businesslike way, completely different from any Hollywood boxing or Hong Kong martial arts style, and rather resembled the way British soldiers are taught to tackle similar situations.
Among the directors was Imo Moszkowicz, who had also directed a German TV series starring Josef Meinrad as Father Brown.