On a stormy night, a group of close associates was invited to the mansion of the controversial billionaire and botanist, 'Othman Al-Mahdi'. Othman owns a high-tech glass conservatory (a botanical vault) in his mansion's garden, housing rare and poisonous plants. The conservatory is completely isolated and operates on a strict automated system.
At 02:30 AM, Othman was found murdered, struck on the head with a sharp object inside the conservatory. His clothes were completely soaked in a sticky blue substance. The catch is that the conservatory features an environmental and security system that automatically locks the doors and sprays a nutrient mist (blue in color) at specific times.
Most of the people present at the mansion have good reasons to get rid of Othman, and some claim to have seen or heard strange things. The police are baffled by the conflicting timelines of the testimonies and the physical evidence found at the crime scene.