Crime scene: 162 mystery solving puzzles to find out who the murderer is

Chapter 4 Boiling Coffee

Detective Harry went hunting in the forest. Seeing that it was getting late, he set up his tent in the open space and prepared to camp.

Suddenly a young man came to tell Harry that his friend Carter had been killed.Harry asked what his name was, and he said, "My name is Felt. An hour ago, Carter and I were about to have coffee when two big men came out of the woods, tied us up, and knocked me unconscious. Yes, wake up and see, Carter has..."

After Harry finished listening, he patted Felt on the shoulder: "Let's go and have a look together." Then he followed Felt to the campsite.Carter's body lay beside the dying fire, two ropes were scattered at Carter's feet, and the canvas bag next to it was turned over in a mess.Harry bent down and saw that Carter's blood had coagulated, and concluded that he died an hour ago. The murderer crushed his skull with a blunt instrument to kill him.

His eyes returned to the fire, the fire was burning very vigorously, the black coffee pot was making a "hissing" sound, and the freshly boiled coffee overflowed from the pot to the outside, emitting a charming aroma, dripping on the still over burnt charcoal.Harry stood silently for a while, then suddenly took out his pistol and pointed it at Felt and said, "Stop acting, tell the truth!" Do you know how Harry inferred that Felt killed someone?
【Answer】Harry said: "If the coffee had been brewed an hour ago when the mob came, it would have been dry by now, and it would not have overflowed. You must have killed Carter before you started making the coffee."

(End of this chapter)