19
The landlady’s frowning face softens as she slips the money into the pocket of her apron. From this same pocket she removes a key which is stamped with the number 4, and she hands it to you. Then she points to a corridor on the ground floor which leads to your room at the rear of the building.
As you are about to insert the key into the lock, you hear a suspicious noise coming from inside. Silently you unsheathe your weapon, unlock the door, and then fling it wide open.