Lia D. Mortensen

The anguish that haunts Cruz over his previous actions boils over, as he puts himself and his fellow firefighters in jeopardy. Casey and his sister Christie try to solve their issues with their mother and each other. Meanwhile, Severide reaches out again to an important person from his past as a favor to Lieutenant Whaley and the squad gains new perspective after assisting the bomb squad on an extremely dangerous call.

Will (Nick Gehlfuss) is troubled with a moral decision when his former teacher, Dr. Bella Rowan (guest star Jean Moran), is faced with a life-threating disease. Dr. Rhodes (Colin Donnell) and Dr. Bardovi (guest star Shiri Aljadeff) get involved in a sensitive situation when Rhodes disagrees with the father of a young patient regarding a risky procedure. Dr. Charles (Oliver Platt) and Sarah (Rachel DiPillo) handle an unusual case with a pilot that causes Sarah to have memories of Jason Wheeler's suicide. Maggie (Marlyne Barrett) takes an aggressive approach to training a new nurse. S. Epatha Merkerson, Yaya DaCosta, Brain Tee and Torey DeVitto also star. Lorena Diaz, Tosin Morohunfola, Mekia Cox and Patti Murin guest star.

Following a murder that appears to be a hate crime, Teresa risks tipping Gibbons off to her big-picture plan by boldly taking on the Chicago Police Department’s corrupt “meritorious” promotion system. Meanwhile, Jarek is forced to face his own reality when Vonda receives an anonymous package that reveals more about the Wysocki family.

It's the moment of truth for the city of Chicago and the Chicago Police Department. FBI Special Agent Cuyler (guest star Adam Arkin) returns to pay Superintendent Colvin a visit, and Jarek stops at nothing to address family issues that have haunted him for years. When Jarek and Teresa are forced to put everything on the line, the stakes are raised as their case against the kingpin of corruption in Chicago comes to a climactic conclusion.