A temporary chief fills in for Boden, who is forced to take some time off for personal reasons.

After the Amanda Tanner case takes a shocking turn, one-time friends Olivia and Cyrus take heated, opposing viewpoints, and Cyrus tries to help in investigating the personal lives of Olivia…

The hospital staff is left to deal with the aftermath of George’s passing. Hitting the staff hard, they all find unique ways to get through the various stages of grief….

A gunman opens fire at a local college, sending mass casualties to the hospital; Arizona’s return is not warmly received.