On a stormy autumn night, inside the isolated Al-Rashidi family mansion, billionaire tech mogul Youssef was found murdered in his private office. The office is a small, completely soundproof glass building situated in the middle of the mansion's garden, fully furnished with thick, soft white carpeting.
At exactly 9:30 PM, Youssef stopped responding to calls. The group went out to check on him, only to find him lying on the white carpet, bleeding from the head after a fatal blow from a crystal paperweight. The glass office door is equipped with a smart electronic lock that meticulously records every opening and closing.
The confirmed timeline indicates that Youssef entered his office at 8:45 PM. There are no strange fingerprints, and the office is designed so it can only be entered through the main door or a small manual ventilation window. The police are baffled: how did the killer get in and out without leaving a trace, and who among those present in the mansion is the real culprit?