On a stormy autumn night, the controversial billionaire and art dealer 'Jalal al-Din' was found dead from a fatal blow to the head inside his luxurious glass office on the top floor of his private gallery. The body was discovered at exactly 21:00 by a security guard.
The office features a unique design; its entire ceiling is a panoramic glass dome. There are no security cameras inside the office itself to respect the victim's privacy, and there are no windows that can be opened. The police were called immediately, the crime scene was fully secured, and the suspects were narrowed down to just five people who had access to the building or were in its vicinity that evening.
Investigators are facing a complex web of lies and intertwined motives. The culprit left behind a seemingly perfect crime scene, relying on a clever plan to manipulate the timeline. As a master puzzle solver, your task is to analyze the bare facts, ignore the misdirection, and uncover the single flaw the killer overlooked.