Episode one of season four is written by Lee Child, whose books the series is based on. In the premiere episode, Reacher suspects a woman on a New York City subway could be a suicide bomber. His investigation draws him into a deadly shadow war with a terrorist cell and a conspiracy that threatens his life. The episode stars Alan Ritchson, who returns as the title character, along with Armando Alera, Anggun, Dean Armstrong, Marc Blucas, Kevin Corrigan, Karen Kwong-Chip, Joel Labelle, Sydelle Noel, Kathleen Robertson, Christopher Rodriguez Marquette and Kevin Weisman.