The employees of my Corporation were puzzled when they entered the office on a hot Summer morning and discovered that the Heating, Ventilation, and A/C system was missing. The large, steel unit, usually mounted on the roof, had disappeared without a trace. The employees searched the entire office complex however there was no sign of the missing equipment. The mystery surrounding the missing Heating, Ventilation, and A/C system deepened when the security cameras were inspected. They revealed that no one had entered or left the building at the time of the disappearance. There was no evidence of any forced entry or break-in. It was as if the air conditioner had vanished into thin air. As the investigation progressed, a few theories emerged. Some speculated that it might have been a planned heist by a professional thief who had managed to bypass the security systems. Others believed it could have been a rival dealer’s attempt to sabotage our Corporation by stealing our equipment. However, none of these theories could be proven, and the mystery remained unsolved. Days turned into weeks, and the employees suffered from the sizzling and stuffy office environment separate from relief. As the Summer progressed, tempers grew short, and morale plummeted. As the boss, I decided to invest in a new Heating, Ventilation, and A/C system and beef up the security systems to prevent a repeat of the different incident. The mystery of the missing Heating, Ventilation, and A/C system remained a topic of conversation in the office long after the incident had occurred. Some employees even joked that it might have been the work of aliens. However, the truth behind the mysterious disappearance remained a secret, and the event remained a mystery.