El Mal Invisible S01E04 - Operació sleepers

Although they don't admit it, the Mossos are already working with the hypothesis of a serial killer and are organizing an operation to catch him: Operation Sleepers. Sergeant Molina volunteers to infiltrate the homeless, but the nights spent outdoors end up undermining his health and morale. Meanwhile, the Mossos recommend that the homeless not spend the night alone, but problems arise and Jonas leaves the group's protection.