The Man With The Black Cord is a novel written by Augusta Groner in 1911. The story revolves around a detective named Joseph Muller, who is tasked with solving a murder case. The victim is a wealthy man named Rudolf Grell, who is found dead in his office. Muller's investigation leads him to a suspect, a man named Karl Hansen, who is known to have had a motive for the murder. However, Hansen has an alibi that seems to be foolproof.As Muller continues...