The Unseen Ear — Natalie Sumner Lincoln

The Unseen Ear: Judith Richards is seated alone in her father's library at midnight when a man enters rifles her father's safe, and is examining his loot when a steel blade darts thru the portières pierces him and he falls dead to the floor. Judith meanwhile has remained undisturbed, for she is seated with her back to the intruder and, moreover, she is stone deaf! Only when she finally rises to leave the room does she discover the crime, and recognize the victim as the stepson of her uncle. Detective Ferguson comes to the conclusion that the murder must have been an inside job, and everyone in the household comes under suspicion. Ferguson is right in his theory, but it is not until much evidence against each has been untangled that it is discovered which one is guilty