The Mysterious Corridor of Time and Space 4: The Cloudtop Secret Chamber

In 2099, reached through the time corridor, a super skyscraper floats high above the ground. A tech tycoon is murdered in a "cloud chamber" with an airtight security system, and all the data shows that no one entered or left. The killer exploits a vulnerability in the AI security System and the trust placed in it, using preprogrammed commands to make a cleaning robot set up the murder weapon, such as releasing a specific allergen or poison... What amazing adventures await the four-person team?