When The Machine gives them the number of a mob enforcer whose life becomes endangered, Reese and Finch must decide whether to intervene or allow karma to balance the scales of justice. Meanwhile, Finch seeks aid from an unlikely source.
September 26, 1864. Racial tensions in Five Points run high when a black pastor is suspected of killing an Irishman, and the Morehouse family attempts to capitalize on the situation. The search for Corcoran’s missing wife unexpectedly lands in the hands of Eva Heissen.
Connor continues his search to uncover the secrets of Mystic Falls and tries to convince Jeremy to work with him. With Dr. Fell’s help, Damon and Klaus question Connor, but the confrontation takes a lethal turn. Trying to keep her new life as normal as possible, Elena is determined to continue her senior year at Mystic Falls High with support from Matt and Caroline. Rebekah’s arrival at school makes it difficult for Elena to control her anger, but she learns that confronting Rebekah can be extremely dangerous. Later, Rebekah realizes how alone she is, and reaches out to April. Stefan takes Elena on a thrilling motorcycle ride in an effort to show her that life can still be fun. Tyler gets a surprise visit from Hayley, a werewolf who helped him through the ordeal of breaking his sire-bond to Klaus. Concerned about Elena, as well as his own emotions, Stefan turns to a sympathetic Caroline for advice.
Aware that Derek might never operate again, Meredith stops talking about the surgeries she's performing. Meanwhile, Richard calls on Dr. Catherine Avery to help him perform a complicated procedure, as things continue to heat up between Jackson and April; and Arizona's struggle to accept her fate forces Callie and Alex to face their guilt.
When Sherlock investigates what appears to be a series of murders at a top Wall Street firm, he may himself fall foul of a sociopathic slayer. Joan is set up on a blind date and shows investigative instincts.
Lola has no friends or pets so she gets a law degree and defends Owen.
A new job offer for Ben causes Leslie to contemplates their future. Meanwhile, Ron and Andy take Diane's girls out trick-or-treating, and Tom searches for a new business idea.
It's Halloween in the office and Andy invites his college a cappella group to perform, which leads to a confrontation with his frenemy Broccoli Rob. Meanwhile, Dwight finds evidence that a madman is loose in the office and tries to track him down, and the first meeting of Jim's new job causes a fight with Pam.
The gang make a disturbing discovery after crashing Maureen's wedding.
Claire must reign in her enthusiasm for Halloween and keep her celebration kid-friendly; Phil decides to hold an open house on Halloween; Mitch and Cam have a costume party; Gloria's hormones make her more quick-tempered than usual.
Sam and Dean investigate a bizarre murder in a college town. Close on the tail of their suspect, they bust into an apartment to find two dead bodies and a laptop cued up to some disturbing video footage.
Sue accidentally runs over Axl's foot while practicing driving; Axl looks forward to voting; Brick binges on Halloween candy.
Casey faces pressure to cover for a cop's son, who was responsible for a drunken-driving accident that left a teenager paralyzed. Meanwhile, Severide ignores his doctor's warnings that his neck injury may never heal if he doesn't seek treatment; and Mills must choose between working at the fire department full-time or helping his mom with her restaurant.
When a legless body is found in the New Mexico desert and a second unwilling amputee shows up at the hospital, the BAU team searches for this amateur surgeon before he preys upon his next reluctant victim. Also, Reid's phone calls to a mystery woman have the team intrigued.
An exorcist is called to Briarcliff to help save a troubled farm boy; Sister Jude's darkest secret is revealed.
Oliver is surprised when someone shoots and kills one of his targets. As his plan is to bring people to justice vs. outright killing them, Oliver doesn't appreciate the help and searches for the gunman. He soon learns that the man, Deadshot, is taking out businessmen who are scheduled to bid at an auction on an energy company and Walter is one of the bidders. Realizing he can't protect his family and stop Deadshot at the same time, Oliver enlists Detective Lance's help, but his plan has dire consequences. Meanwhile, Laurel and Tommy get caught in an awkward situation with Oliver.
The boys plans to go as the Avengers for Halloween go awry when Randy can’t go at the last minute and Stan has to help his father with a new business venture.
The mystery surrounding the death of Alicia's father grows as Julio makes a new discovery. A man shows up at the hotel with strong connections to Andres.
In Memphis, TN, Lt. Caroline Mason revisits the 2007 homicide of a 19-year-old man shot to death during a street fight that got out of hand. But when 26-year-old DeMario Thomas went to trial in 2009, the victim’s mother surprised everyone. While in Louisville, KY, a prosecutor’s case comes close to collapse when an unforeseen twist of fate threatens to let an alleged murderer walk.