 When he rushes into the building, he finds his assailant was her English husband, who has been systematically tracking down and killing all those involved in her rape.The screenplay was adapted by Philippe Labro, Jacques Lanzmann, and Vincenzo Labella, from "Ten Plus One", a police procedural novel by Ed McBain.Detective Steve Carella in Ed McBain's novel was renamed Stéphane Carella in the French version.