The New York Times has introduced a documentary audio series that follows Rukmini Callimachi, who covers terrorism for The Times, on her quest to understand ISIS. Today, as a special episode of “The Daily,” we offer Chapter 5 of “Caliphate,” in which an ISIS recruit carries out a killing — then questions everything. To sign up for a weekly dispatch from Rukmini and find out about new episodes of “Caliphate,” visit nytimes.com/caliphate.
This episode includes disturbing language and scenes of graphic violence.
