Which episode of the Crime Hunting Illustration is about installing fertilizer in the hotel?

Episode 17. Plot: In the Whig Hotel that has not yet been built, Ducheng kneels next to a corpse, and this corpse is M who just fell to his death. Ducheng opened M's hand and took out a clothes button, and then used car glass water and sand to clean up the traces of the scene. Finally, he closed M's open eyes, picked up the watch on the ground, and left. It is filled with sand instead of fertilizer.