Severide puts his job on the line to help out one of their own. Kidd navigates Natalie’s complicated relationship with her sister. Herrmann prepares to take the Chief test.

Cast: Taylor Kinney, David Eigenberg, Joe Miñoso, Christian Stolte, Miranda Rae Mayo, Daniel Kyri, Hanako Greensmith, Jocelyn Hudon, Jake Lockett, Dermot Mulroney