Seven months after two teenagers are murdered outside Vallejo, California, the killer reemerges. He shoots two young people at a park on the outskirts of the city, but this time one of the victims survives. Shortly after the attack, the killer calls the Vallejo police department and sets in motion a pattern of communication that will be unrivaled in American criminal history. A month later, he sends letters to three newspapers and includes a cipher that contains a coded message.   Join Black Barrel+ for ad-free episodes and bingeable seasons: blackbarrel.supportingcast.fm/join   Apple users join Black Barrel+ for ad-free episodes, bingeable seasons and bonus episodes. Click the Black Barrel+ banner on Apple to get started with a 3-day free trial.   On YouTube, subscribe to INFAMOUS+ for ad-free episodes and bingeable seasons: hit “Join” on the Legends YouTube homepage.   For more details, please visit www.blackbarrelmedia.com. Our social media pages are: @blackbarrelmedia on Facebook and Instagram, and @bbarrelmedia on Twitter. Learn more about your ad choices. Visit megaphone.fm/adchoices