They Do It With Mirrors
by Agatha Christie (Dodd, Mead and Company, 1952)
audiobook read by Joan Hickson (Lamplight, 2015)
While the confrontation in the study need arouse suspicion, Christie then succeeds in drawing attention elsewhere, not actively deceiving or manipulating her audience so much as lulling it through conversational overload (an effective if inelegant use of omniscient narrative). Everything hangs together.