last outgoing call. at 7:00pm the night before. >> how far away would it have been? >> 20 miles. >> reporter: but that's all the detective knew. a week gone by, everyone at hardy windows was cleared. so no suspects at all. detective trapp went to church, said her rosary, worried, prayed, and wondered. >> i had heard a story on the news that there was three missing prostitutes in the city of santa ana. >> which is right next door, basically? >> right next door, yes. >> reporter: what if this wasn't the killer's first time, or last? >> coming up, four young women in two neighboring towns now missing or dead. was there a link? >> we were like, what are the odds that they're related? >> when "good & evil" continues. with every attempt to free itself,