The patients know what happened to them. Now they learn who did it. The story of the nurse whose own pain was also unseen. 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