A real classic. A basic pillar of the how-done-it variant in mystery fiction. After reading the infinity of far-fetched solutions to "impossible crimes" provided by many "specialists", the simplicity of the final outcome is a gratifying reading experience to the authentic connoisseur. A nourishing mental delicatessen. A suggestion: try to solve the candles enigma comfortably sitting in an armchair while you listen Bach's Toccata and Fugue in D minor. Good reading!