 PLOT: When Mr. Boddy instructs the guests to murder Wadsworth in the  study, he turns off the lights and the room is henceforth plunged  into complete darkness. A gunshot is heard, and when the lights are  switched back on, Mr. Boddy is apparently dead, resulting in  confusion over how he was killed (the bullet only grazed his ear),  and who tried to shoot him. None of this would have been possible  considering the fire burning in the fireplace would have  sufficiently illuminated the entire room.