Book excerpt: Breaking down her door in response to the sounds of a violent attack and a gunshot, Mademoiselle Stangerson's rescuers are appalled to find her dying on the floor, clubbed down by a large mutton bone. But in a room with a barred window and locked door, how could her assailant have entered and escaped undetected? While bewildered police officials from the Sûreté begin an exhaustive investigation, so too does a young newspaperman, Joseph Rouletabille, who will encounter more impossibilities before this case can be closed.