Harry, Fergus, and Lola are invited to a murder-mystery party in a hotel on a secluded island. The fun quickly turns deadly as they realize a real murderer lurks among them, willing to kill everyone present.

The kids find themselves in an alternate dimension full of visions from their past. They must find their parents and Alex before time runs out. One person is left behind.

Monk goes to the emergency room with a persistent bloody nose due to a bump on the nose, which he becomes convinced is actually a cerebral hemorrhage, and discovers the doctor he sought out for second opinion, dead on his office floor.

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.

Dex and Grey venture to Los Angeles to help a client who believes her Hollywood script has been plagiarized by a former classmate. Reluctantly, Grey leaves Ansel and Tookie in charge of The Bad Alibi, and against his wishes, Tookie hosts a birthday party at the bar.

A woman is found dead in a storage container belonging to the actor she was stalking, and Lieutenant Tao works as a consultant for the actor's police drama.

Intelligence tracks down a vigilante killing rapists and Burgess questions whether the men who attacked her sister have really been punished.

Dr. Lightman's ex-wife shows up, and asks him to tackle an arson case. Torres works the case of a drive by shooting that killed a member of a rapper's entourage.

Harry, Fergus, and Lola are invited to a murder-mystery party in a hotel on a secluded island. The fun quickly turns deadly as they realize a real murderer lurks among them, willing to kill everyone present.

Dex and Grey venture to Los Angeles to help a client who believes her Hollywood script has been plagiarized by a former classmate. Reluctantly, Grey leaves Ansel and Tookie in charge of The Bad Alibi, and against his wishes, Tookie hosts a birthday party at the bar.

Monk goes to the emergency room with a persistent bloody nose due to a bump on the nose, which he becomes convinced is actually a cerebral hemorrhage, and discovers the doctor he sought out for second opinion, dead on his office floor.

Intelligence tracks down a vigilante killing rapists and Burgess questions whether the men who attacked her sister have really been punished.

Dr. Lightman's ex-wife shows up, and asks him to tackle an arson case. Torres works the case of a drive by shooting that killed a member of a rapper's entourage.

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.

After being trapped in the Dark Dimension for six months, the kids must contend with the new Wizard phone craze that is sweeping the city and may hint at darker things to come.

The popular owner of Fergus's boxing gym is found murdered in the Dublin Mountains. The gym was in debt, and the dead man had trouble with both his future wife and his ex-wife. Fergus asks Harry to help him find the killer.

When a deceased dog is accused of murder, Monk finds himself in the employ of his biggest fan, Marci Maven. Obsessive-compulsive meets completely obsessed.

Major Crimes appears to be dealing with a possible sniper while investigating the murder of a man who runs a "revenge porn" website. Meanwhile, Sharon's son voices his opposition to Rusty's adoption.

Dr. Lightman's investigation into a questionable police shooting could jeopardize a terrorism investigation, while Eli's lie in an earlier case could hurt the firm. Meanwhile, is Dr. Foster's husband having an affair as Lightman suspects?

Dex takes on a new case helping a mother who has lost custody of her children, which triggers parallels to her time in Afghanistan. After memories of Afghanistan reemerge, Dex spirals and must face the reasons behind Benny's death. Back at The Bad Alibi, Grey and Tookie coach Ansel on how to ask a girl out on a date.

Riggs and Murtaugh are on the case of a hitman who Murtaugh has been following for almost 17 years.

Intelligence enlists Firehouse 51 to help prevent the latest in a series of bombings targeting the media.

Sarah makes a grim discovery in regards to her past; Holder catches an unsettling case; Seward shows his true colors.

Major Crimes appears to be dealing with a possible sniper while investigating the murder of a man who runs a "revenge porn" website. Meanwhile, Sharon's son voices his opposition to Rusty's adoption.

Dex takes on a new case helping a mother who has lost custody of her children, which triggers parallels to her time in Afghanistan. After memories of Afghanistan reemerge, Dex spirals and must face the reasons behind Benny's death. Back at The Bad Alibi, Grey and Tookie coach Ansel on how to ask a girl out on a date.

Dr. Lightman's investigation into a questionable police shooting could jeopardize a terrorism investigation, while Eli's lie in an earlier case could hurt the firm. Meanwhile, is Dr. Foster's husband having an affair as Lightman suspects?

Riggs and Murtaugh are on the case of a hitman who Murtaugh has been following for almost 17 years.