Ruzek teams up with an old coworker to dismantle a crime ring, but everything is not as it seems; Voight and Burgess work together on an investigation.
The team strategizes to bring down a drug ring as Voight works to build trust with a new informant, but he soon realizes the informant has her own agenda.
The team slowly realizes there is more to the story than just a random act of violence in their stabbing case; the FBI turns up the heat on Upton and Halstead.
The team realizes their missing child case is more complicated than they thought; Burgess and Ruzek are stunned when someone from Makayla's past shows up.
A city bus crashes into a building, stories in the air, after the Hollywood Reservoir dam breaks; Maddie searches for a trapped cyclist in need of rescue.
The crew responds to multiple baffling emergency calls; despite his burgeoning feelings for Christopher's former teacher, Eddie does not feel ready to move on.
A man becomes trapped underneath a large car; a garage band gets dangerously enthusiastic; Michael wants to learn why his neighbors are acting peculiarly.
A drunk driver sends the team responding to a freeway pile-up that has killed multiple people caught in it; Maddie starts the beginning stages of labor.
Several calls involving parents and their children come in, including a birthday party that goes horribly awry; May discusses her previous suicide attempt.
A familiar figure to the 118 is left in critical condition after a hit-and-run incident; Athena gets help from Buck to investigate a missing person case.
When a car dealer's wife vanishes, police suspect her husband of killing her, but when neither a body nor murder weapon is found, a series of mistrials ensue.
The death of a woman in her SUV prompts the police to investigate her life which was a tangle web of sex, lies and dark family secrets she's kept hidden away.
The death of a woman in her SUV prompts the police to investigate her life which was a tangle web of sex, lies and dark family secrets she's kept hidden away.