The series follows two detectives from Singapore and Malaysia, Serena and Megat, as they join forces to investigate a double murder case., An El Paso detective, Sonya Cross, and Marco Ruiz, a Chihuahua State Police Officer, are forced to work together when the body of a murdered judge is found on the bridge connecting El Paso and Juarez and is linked to a serial killer operating on both sides of the border., Sonya meets a man connected to her past in the Season 2 premiere. Meanwhile, Marco questions his safety., Two detectives—one from the U.S., one from Mexico—must work together to track down a killer who is operating on both sides of the border., Two detectives, one from the U.S., and the other from Mexico, have to work together to track down a killer, who is operating on both sides of the border.