The script was an Agatha Christie-inspired murder mystery that took place entirely at the scene of a crime, with one lone human character, FBI agent Del Spooner, investigating the killing of a reclusive scientist named Dr. Alfred Lanning, and interrogating a cast of machine suspects that included Sonny the robot, VIKI the supercomputer with a perpetual smiley face, the dead Dr. Lanning's hologram, plus several other examples of artificial intelligence.