Castle and Beckett investigate the murder of a dockworker turned bar owner who's body is found floating in the East River. In the process of the investigation they uncover a secret buried since the days of Prohibition.
While picking in Pennsylvania, Danielle sends the guys to Bushkill Park–a century-old amusement park that’s seen much better days. Hoping to eventually renovate and reopen, owner Neil is motivated to sell just about anything. And, after stepping back in time and playing in the old funhouse, Mike spies a couple of rare vintage sideshow banners. Also in this episode… Deb wants husband Tom to clear out his sprawling collections so they can enjoy their retirement on the road in their RV. But he’s reluctant to sell his prized possessions. Later, in New York City, the guys meet an expert who has shocking news about Mike’s new circus posters. In Staten Island, a cavernous abandoned storage unit yields plenty of carnival keepsakes.
Mike allows Carl to bring a date to his apartment, so he decides to spend some time at Molly's house where he actually manages to bond with Molly's mother and sister.
One of Brenda's detectives is ambushed on the street, and the main clue to figuring out the motive behind the attack is a garbage bag containing more than $37,500. The investigation then turns into a race to clear the detective's name over allegations of witness tampering.
On the 200th episode Horatio must find an attacker and save a pregnant woman and hope he has an idea as to why she was attacked.
Gabrielle desperately tries to figure out a way to keep Grace in her life; Keith plans a very special dinner with Bree; Tom is angry at Lynette for not disclosing his special attributes to the other ladies; Renee tells Susan a deep, dark secret; and Paul's plan for Wisteria Lane is revealed
When the rest of the family seems to lack Christmas spirit, Marge contacts Martha Clause.
Nucky faces Election Day in Atlantic City and pulls out all the stops to keep power in Republican hands. Torrio brokers a discussion between Nucky and Rothstein to resolve their growing gang war, as well as Rothstein's looming federal indictment over the World Series. Both Jimmy and Eli voice their growing resentment towards Nucky, and find they have an ally in the Commodore. Van Alden seeks a sign on whether or not to leave Atlantic City, but receives unexpected news from Lucy. Margaret weighs new information about Nucky's first marriage and her uncertain future to make a final decision on her role in his life.
Bo and Dyson go undercover as a married power couple at a swank country club to help an old friend from Kenzi's criminal past. At first they enjoy their taste of the good life – and the chance to play house. But soon the emotional pressure of the charade, and the increasing body count, push Dyson and Bo to a new level in their relationship... and prompts Dyson to give Trick an ultimatum. It’s time for them to tell Bo all they know about her origins once and for all. But before Dyson has a chance to come clean to Bo, an unexpected arrival drops by and tries to silence him for good.
Dexter must do damage control; Debra's speculation begins to take shape; Quinn becomes involved in a homicide.
If there’s one thing that Stan Smith loves, it’s a good jury trial. He anxiously awaits his annual jury summons. But when Roger is the defendant in the trial where Stan is the foreman, he is finally in a position to make Roger accountable for his misdeeds. Meanwhile, Jeff and Hayley move in with the Smiths, and Francine tries to get Jeff to clean up his act.
Rick and the group are allowed into the CDC by a strange doctor, but all is not what it seems in their newfound haven.
Cece and Rocky join karate class. Meanwhile, Ty notices he could be getting fat. He decides to go on a special diet but he just keeps getting fatter.
Having failed to save a twelve year old mute boy from the gallows,Garrow enters the civil court to hear Hill's accusation of adultery against him in a deeply depressed mood,despite Sarah's assurances. Silvester,previously his adversary,defends him in the spirit of fair play and does well,demolishing Hill's Admiralty cronies,the prosecution witnesses,whilst Mary,Sarah's loyal maid,refuses to perjure herself. However,it is the dogged and devoted Soutouse who saves the day by bringing in a surprise,last minute witness to expose Hill's hypocrisy.
Lucienne is preoccupied with the news of her pregnancy, and seeks spiritual guidance before making a serious decision.