Starring Jock Mahoney.
Yancy Derringer is a gentleman adventurer living in New Orleans, Louisiana, after the Civil War. Widely respected, he is hired by the city administrator, John Colton, as a secret agent authorized to help maintain law and order and justice in the city by any means that may become necessary.
His constant companion is a Pawnee Indian who communicates with him only by hand gestures, and appears ready at a moment's notice to use the shotgun that he always carries. Yancy owns a riverboat, the Sultana, and lives at the former family plantation, Waverly.
Madame Francine is his love interest. Miss Mandarin is the proprietor of his hangout, the Sazarack Restaurant.