In this mystery a Scotland Yard investigator and a police doctor unite to find "The Ringer" a mysterious killer and master of disguise before he can kill a lawyer who just received notice of his impending demise via a lovely bouquet with a note informing him that he has 48 hours to live. During their hurried investigation, the pair learn that the attorney's secretary had recently killed herself and that The Ringer blames the lawyer for the death. Time flies, and the lawyer does indeed die. It is only then that the investigators learn the killer's true identity. The story is based on an Edgar Wallace story.