Barney declares February 13th a holiday for desperate women. Marshall receives a Valentine’s Day surprise from Lily. Zoey and Ted work on figuring out their relationship.

When a witness under Van Pelt’s protection is killed, her position within the CBI comes into question.

Troy and Abed compete for the attentions of the college librarian, while Britta strives to be progressive and befriends a fellow female student whom she believes is gay. Meanwhile, Jeff finds himself reluctantly hosting an impromptu party at his apartment when Professor Duncan invites himself over to watch a soccer match.

Claire and Phil decide to reprise their role-playing adventure from last year’s Valentine’s Day. Jay’s surprise plans for Gloria keeps getting interrupted. A secret admirer comes between Cameron and Mitchell.

Axl has a new girlfriend he wants to impress on Valentine’s Day, while Brick has a crush on a fellow student and Mike accidentally lets the news slip out, humiliating his shy son. Elsewhere, Sue searches for a boy she kissed on a Halloween hayride.

When an old friend of June’s late husband shows up at Neal’s doorstep, Neal suspects he’s looking for more than a trip down memory lane.

When an old friend of June’s late husband shows up at Neal’s doorstep, Neal suspects he’s looking for more than a trip down memory lane.

While Alicia races against Louis Canning to round up the most clients for an Erin Brockovich-style class action lawsuit, a mole is detected in LGB law firm, who seems to be working for Louis.

Anna uses her newest gift to mankind, « Concordia, » as a cover to hide an invading fleet of breeding vessels that will be used to ensure the perpetuation of Visitors for future generations. Meanwhile, Eli Cohn tries to convince Erica and the Fifth Column that the « Concordia » gala is the perfect time to assassinate Anna.

The brutal murder of a lottery winner has Castle and Beckett up to their eyeballs in suspects, envious and angered by the victim’s sudden move from the poorhouse to the penthouse. As the precinct buzzes with fantasies of what our cops would do if they won the lottery, Martha struggles with the reality of such a decision when she suddenly inherits money she feels she doesn’t deserve.