In Detroit, Michigan the BAU investigates several murder victims found morbidly incorporated into graffiti. They believe the murders to be the work of a notable street artist.
With the rest of the team racing to stop an illicit weapons sale, Rex resolves to bring justice all on his own when he witnesses a murder while stuck at home.
Donovan tracks a marine smuggling operation, the team investigates the night of a wedding to uncover why the best man ended up at the bottom of the Atlantic.
Monk* S8:E7
Natalie displays surprising belief in superstitions when Monk consults on a case that involves Voodoo. Unfortunately, her uneasiness turns to terror when the killer targets her.
Monk* S8:E8
A new HMO restriction on individual therapy forces Monk to join one of Dr. Bell's groups just as its members are being murdered.
Monk* S8:E9
While Natalie attempts to surprise Monk with the ultimate 50th birthday party, a janitor and a patent lawyer are killed during the launch of the first vacuum with a self-cleaning filter.
The discovery of a dead college student in a hazardous-waste drum alerts Major Crimes to a kidnapping plot; the team races to find a second victim before she, too, is killed.
The death of a quarterback threatens to spark racial tensions at a local high school, and the investigation puts a member of the team in grave danger.
As tension builds, the staff at the Walsingham Hotel rebel. Meanwhile, Book discovers something quite curious in Captain Victor Orr's little black book.
Sarah asks Marissa to investigate the death of a resident at a seniors' apartment.
A client hires Wong to recover a painting discretely, however those who hold the stolen artwork are other than reputable.
Rossi's daughter, a journalist, investigates the disappearance of a college student. JJ comes back from maternity leave.
The team heads to Phoenix, Arizona to hunt a serial killer who tortures his victims using sleep deprivation. Hotch, Morgan, and Garcia continue their on going search for the dirty dozen.
While CPD tries to take down a drug kingpin, Atwater faces a tough choice.
Antonio crosses a line that puts the entire team at risk.
Voight and Ruzek lock horns over how to handle the aftermath of the Antonio situation. Meanwhile, a series of violent carjackings turns deadly, and Ruzek must rely on a C.I. he grew up with to help solve the case.
On Election Day Reese shoots a potential jumper and is forced to go into counseling. The new number is for a pollster who suspects the election for Governor of New York was rigged. It was - by Samaritan, and his life is now in danger.
John and others try to prevent a fake detective from getting himself killed, while Harold attends a conference in Hong Kong.
Murtaugh and Riggs respond to the murder of an escaped patient of Dr. Cahill's who mysteriously goes off the rails. The investigation brings to light a hidden scheme far bigger than they imagined. Meanwhile, Riggs' anger gets the better of him once again, causing Avery to consider whether or not he is fit to serve. Also, family tension runs high between Murtaugh and Trish, who have to make big decisions about R.J.
When Detective Bailey's sister, Jess, runs into trouble with the law, Bailey must decide how far she's willing to go to protect her family. Meanwhile, with Trish away on a company retreat, Murtaugh is left to help Riana navigate boy problems, and Riggs deals with the fallout of a night of heavy drinking.
Murtaugh and Riggs search for the culprit of a local jewelry heist; Murtaugh gets called "grandpa" by another parent while at the playground with Harper sending him into a tizzy; Riggs deals with withdrawal from drinking.
After the city's gun buy-back program is robbed, the team is on a hunt for those responsible. Meanwhile, Murtaugh walks on thin ice with Trish, Riggs finds an unlikely friend in Ruthie, and Captain Avery is reunited with a college "frenemy" who has key information about the case.
After the fatal end to an argument on a construction site, the squad works to untangle facts about the incident. Meanwhile, Riggs struggles to rekindle his relationship with Molly, Trish's job is on the line as she tries to close a big deal at work, and Murtaugh gets one last chance to make it right at home.