In the middle of the night, Pfc. Bowe Bergdahl grabs a notebook, snacks, water, some cash. Then he quietly slips off a remote U.S. Army outpost in eastern Afghanistan and into the dark, open desert. About 20 minutes later, it occurs to him: he’s in over his head.  Our newest podcast, “The Good Whale,” is out now. Search for it wherever you get your podcasts, or follow it here: https://lnk.to/good-whaleTo 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