The three taps : $b A detective story without a moral

"The Three Taps: A Detective Story without a Moral" by Ronald Arbuthnott Knox is a mystery where Miles Bredon finds himself investigating the suspicious death of Mr. Mottram, a rich man who apparently died from gas poisoning. The puzzle begins with Mottram's Euthanasia insurance policy from the Indescribable company, which pays out if the insured dies young, and the case gets complicated when Mottram, worried about his health after hearing he only has two years, dies mysteriously at the Load of Mischief inn shortly after visiting the company. The strange setup of a locked room, an open window, and weird happenings around the death suggest there's more to the story as Bredon starts his investigation, hinting at hidden reasons and maybe even murder, all told with a touch of dark comedy and suspense.