Phil’s preoccupation with a business opportunity blinds him to his new partner’s inappropriate behavior around Claire. Jay and Gloria may regret letting Mitchell and Cameron be their temporary house guests when their home is being fumigated.
Frankie and Mike decide to try a fresh approach to Valentine’s Day by having dinner out with friends. But a clueless Mike angers Frankie by refusing to present her with a simple romantic gesture. Meanwhile, Axl can’t think of a life-changing moment that’s occurred in his life when he’s assigned to write a school paper on the subject, Brick is tasked with writing a report on love, and a hapless Sue doesn’t understand why her new boyfriend has suddenly turned into a bad kisser.
Neal gets a taste of what his ideal life in New York might be like when he is assigned to work a case with his ex-girlfriend, Sara Ellis.
When Castle and Beckett investigate the killing of a treasure hunter, they discover the case is linked to a mysterious homicide from 1947 involving a hard-boiled private detective. Castle realizes the only way to solve the present-day murder is to solve the murder from the past. The 1947 case comes to life through stylized flashbacks, featuring Castle as the private eye and Beckett as a femme fatale.
Lily asks for her father’s help when she and Marshall decide to throw a housewarming party. Marshall’s boss gets under Ted’s skin and the two nearly come to blows, and Barney puts the moves on a wacky divorcée.
Jeannie has to take charge of the Pod when the racist CEO of a motel chain has reservations about dealing with Marty. Meanwhile, Clyde hopes to hit it off with a lovely Mormon virgin; and when Monica finds she has some free time on her hands, she decides to spend it with Roscoe.
Over Here Astrid gets an unexpected visit from her Alternate, while Peter and Olivia track a killer using a toxin that has yet to be invented. Both universes collide in a case that pushes the boundaries of what is possible.
Jane and the CBI narrow down the list of suspects after a disgraced clothing designer on the verge of a comeback becomes a fashion victim. Meanwhile, FBI Agent Darcy continues her investigation into finding Red John.
When Elizabeth overhears one of her neighbors in a suspicious conversation, her curiosity leads Peter and Neal to uncover a robbery plot against a posh Manhattan Hotel.
With her investigation complete, Wendy presents her evidence against Will to the grand jury in hopes of sending him to prison for bribery. Eli and Stacie Hall square off once again.