24 - The Three Taps - A Detective Story Without a Moral by Ronald Knox

Dive into an enigmatic mystery where the lines blur between murder and suicide. How could a murderer escape a room leaving the door locked from the inside? Or did the deceased ingeniously manage to turn off the gas after his demise? This tantalizing conundrum, presented in a brilliantly penned narrative, carries an unexpected charm despite its sharp absence of morality.