Almost everyone describes the 17-year-old Adnan the same way: good kid, helpful at the mosque, respectful to his elders. But a couple of months ago, Sarah started getting phone calls from people who knew Adnan back then, and told her stories of a different kind of boy. Our newest podcast, “The Preventionist” is out now. Search for it wherever you get your podcasts.To get full access to this and other Serial Productions and New York Times podcasts on Apple Podcasts and Spotify, subscribe at nytimes.com/podcasts.To find out about new shows from Serial Productions, and get a look behind the scenes, sign up for our newsletter at nytimes.com/serialnewsletter.Have a story pitch, a tip, or feedback on our shows? Email us at serialshows@nytimes.com