When Chase Lloyd is found murdered in his locked apartment, Inspector Craig is baffled. How did the killer get in and out without being seen. When someone jokes that the killer must have had an invisibility cloak, he's skeptical. Then the plans for such a device come up missing. In a locked room mystery with a sci-fi twist, Craig must figure out whether the son of one of the wealthiest men on Tura died by the hand of an invisible killer.