Boomtown

Teresa's ambulance is hijacked by a thief who threatens to kill her if she doesn't save his brother, who's been shot in the heart during a burglary; Ray and Tom go undercover to track down a trio of larcenous pranksters, who get the scare of a lifetime when they're captured; David has a horrifying time at a Hollywood Halloween party when Andrea breaks off their relationship and Marian accuses him of adultery.

Haunted by a promise he made to an old friend, Fearless risks his life to protect a little girl who is the only cooperating witness to a mob hit; Ray and Tom investigate a stolen corpse that was shot through a cannon and landed in a hot tub.

Joel and David face off over negotiating with armed robbers who have taken hostages during the heist of a sporting goods store; stung when he fails to get a promotion based on not ""stepping up"", Ray insists upon going undercover as a paramedic to scope out the situation inside the store; after being recognized as a cop by one of the perps, Ray is beaten, tied up and threatened with death and must convince the store manager, a former actor who once played a cop on TV, to step up to the plate and resist the gunmen; when one of the robbers forces Ray to have a last telephone conversation with his wife, Ray calls Tom instead and gives him the information the swat team snipers need to end the standoff; in the aftermath, Ray discovers an unpleasant truth about the store manager, whose television character inspired Ray to become a cop.

Joel and Fearless work with a claims investigator, who is also Fearless's ex-girlfriend, to uncover the insurance fraud ring behind a fatal multi-car collision.

A powerful Hollywood producer offers to advance David's career in exchange for David's obstructing justice to protect the producer's teenage son who's accused of the murder of a teenager; Joel and Fearless uncover the painful family secret which led to the girl's murder; after David confesses his affair with Andrea, Marian leaves him.

Joel and Fearless enlist the help of Andrea and a psychiatrist in obtaining information about the kidnapping of a teenager from the only witness to the crime, a psychotic homeless man who was Andrea's friend in high school.

Investigating the brutal murder of a homeless man bludgeoned to death with a brick, Joel and Fearless follow up on a tip from Teresa and discover two filmmakers who pay vagrants to become would-be gladiators and battle each other in the park; when the detectives realize that the filmmakers bribed a homeless drunk to land the fatal blows, they team up with Tom and David in the search for evidence to convict them.

Responding to a domestic disturbance call, Ray and Tom find themselves in the middle of a homicide investigation as their feuding couple is linked to a fatal meth lab explosion; when the husband has his throat cut outside of the police station, their drug dealer becomes the prime suspect.

Joel and Fearless search for killers who prey on unsuspecting families in their sleep and stake out the family that they believe to be the next target; when Andrea's reporting skills threaten their investigation, the detectives are forced to give her a front row seat to their trap.

In the hours before his execution, a gangbanger gives McNorris a last-minute ultimatum to either save his life or risk the death of a cop kidnapped by his cohorts; Ray's contacts on the street lead the police to the location where the officer is being held, but they arrive too late to save their fellow officer.

When he responds to a burglary call, Ray finds two cops murdered in an apparent ambush, and discovers that the shooters were tipped off by someone within the precinct; the FBI locks down the station, leaving Joel to uncover the mole; despite Andrea's nearly costing him his badge a year earlier, Ray enlists her help in tracking down the perps.

Fearless faces demons from his past as he investigates the shooting death of a small-time drug dealer.

David awakens from a blackout to find blood and a smashed headlight on his car, and panics when he hears about a late-night hit-and-run; Tom and Ray respond to a possible kidnapping, only to find an elderly Alzheimers patient tied to a bed; as David tries to reconstruct the events of the night before, he raises the suspicions of Joel, Fearless and Ray, whose investigative abilities find the common link between the two cases.

During a search for a kidnapped newborn, Joel and Fearless uncover an obstetrician's plot to steal the babies of recovering addicts; on the eve of entering rehab, David gives Joel the heads-up that IAB is reopening the investigation into Emma's death; Tom takes the upper hand and neutralizes Trumper's attempt to coerce him into snitching on Joel; Kelly and Joel discover that although they each feel guilty for the death of their daughter, there was nothing they could have done to save Emma from the cerebral aneurysm that ended her life.