Beckett and Castle are tasked with solving the murder of man who handed a baby over to a priest just before he died. While playing nanny to the lost child, they must figure out who killed the man, how did he come to have the baby, who isn't related to him, and where are the rightful parents.moreless
Olivia faces a decision that will affect the relationship that she has with the White House; Cyrus and Mellie plot against Josie Marcus while Olivia's team work with her.
A Marine's death raises suspicions from his wife about his last battle. Sam and Callen try to find out whether there has been a cover up. When Hetty invites Operational Psychologist Nate Getz, the team suspects an evaluation is coming up.moreless
Chief Boden takes action to try to help a boy who was seen at two fires previouly, one firefighter is on medical leave after an accident at a fire and Casey and Dawson are gradually seeing each other.moreless
Severide's injury gets worse, an abusive mother makes terrible decision and a train accident takes life of a young person.
Thanksgiving at the firehouse includes a 10-car pileup, a gang shooting, and a meth lab.
When Dawson faces suspension the girl she saved decides to help her. Detective Voight does everything he can to make Casey retract his statement. A dangerous action during an apartment fire may change Casey's situation.moreless
Severide seeks an old friend's help with his injury, a disciplinary action is taken against Dawson and Casey has to deal with the aftermath of opposing Detective Voight.
An elderly woman needs Severide's help, Detective Voight tries to persuade Casey not to testify against his son, Chief Boden is accused of leaving a homeless man to die in a warehouse fire and Shay comes face to face with a man from her past during a call.moreless
Casey has to decide if he should report that a cop's son is responsible for a drunk car accident that left a teen paralyzed. Meanwhile Severide is diagnosed with a fractured vertebra and Mills has trouble sharing his time between his mother and the job.
Lt. Kelly Severide tries to keep his shoulder injury a secret as he helps a construction worker from a collapsed building. Meanwhile two teenagers are stuck in a vehicle.
The members of Firehouse 51 struggle to cope when one of their own dies in a fire. Lt. Matthew Casey and
Lt. Kelly Severide blame each other for their friend's death. Meanwhile Casey goes through a separation with Hallie and
Battalion Chief Wallace Boden has to make a crucial decision.