The film opens in a future Paris with scenes establishing the kidnapping of 22-year-old scientist Ilona Tasuiev, who works for the megacorporation Avalon. The focus transitions to police captain Barthélémy Karas, as he defuses a hostage situation by killing the hostage-takers. Afterwards Karas is given the job of solving the mystery surrounding Ilona's disappearance. Karas begins by contacting Dr. Jonas Muller, a former Avalon scientist familiar with her.