The Cipher (Nina Guerrera, #1)

by Isabella Maldonado

Serial killers were defined as having at least three victims, with a chronological or psychological separation between each event. Mass murderers were characterized as killing at least four individuals in one incident. Finally, spree killers had two or more victims in different locations with no de-escalation period between.

otolaryngologist.” At Nina’s raised brow, he elaborated. “Ear, nose, and throat doctor.”