In the wake of violent targeted attacks on 15 Division, Andy, Swarek and their fellow officers begin to piece together a past crime in order to find out what has happened to Oliver Shaw.
Andy and Chloe are blindsided by an unseen shooter when they respond to a routine 911 call.
When a suspected pedophile is found severely beaten, Andy discovers that Marlo has been carrying out an all-out, unauthorized investigation into the man.
Both Andy and Sam both have something to confess, but is it too little too late for both of them?
Chris' reunion with his rookie family takes a shocking turn when his son, Christian, is kidnapped while in Andy and Nick's care.
Everyone at 15 Division is looking forward to celebrating at Frank and Noelle's wedding. But when a casino-bound bus full of seniors citizens is robbed at gunpoint, all bets are off.
When a missing persons case is reopened, Swarek teams with his training officer to solve it; Chloe and Dov deal with a witch and her client.
The investigation of a missing girl is linked to a possible copycat of one of the squad's most gut-wrenching cases. Detective Luke Callaghan is brought back to 15 Division to help capture the abductor.
When an arrest reveals that drugs contaminated with a deadly bacteria have hit the street, the squad rushes to control the situation
THURSDAY JULY 11 - During a routine traffic stop, Gail and Andy find a teenage boy bound and gagged in the trunk of a car; Oliver, Chris and Swarek track a gunman.
Andy and Officer Cruz butt heads when a disturbed woman forces them to make a crucial decision; an armed burglar is sought after a string of ATM robberies; Dov and Chloe have to work together.
On her first day back, Andy is forced to work a bank robbery case with newly promoted Swarek; a distraught woman gives Nick perspective on his life with Gail; a bombshell is dropped on Noelle.
Andy and Nick continue to work undercover infiltrating a meth pipeline. However their covert mission goes sideways when Nick – then Andy – go missing.