 Someone is killing people using a device that can project a metal slug into the victim's body, the lead revealing no trace of magic when subjected to analysis.Nault is in charge of the investigation, but is somewhat controversial for his non-use of magic in investigations, such as relying on his own perceptions to tell if a suspect is lying rather than using truth spells.While investigating the weapon's possible origins, Nault encounters Winston Churchill, a 130-year-old sorcerer – one of the few people powerful enough to potentially cloak the spells powering such a weapon – who reveals the existence of a strange parallel universe where there is no magic but science rules supreme, and a way to cross between the two worlds.