The lead suspect in an NCIS murder investigation is a woman Gibbs' friend, Phillip Brooks (Don Lake), met on a dating site. Also, Sloane has a secret admirer on Valentine's Day.
In order to hunt down the brutal murderer of a grifting seducer, Castle and Beckett must investigate New York's elite. Meanwhile, Castle plans to surprise Beckett on their one-year wedding anniversary.
Harvey tries to repair a broken relationship - leaving Louis, Donna and Rachel to manage PSL in his absence. Meanwhile, Mike gets a helping hand from an unexpected place.
Harvey is forced into a difficult decision when the impossible is asked of him. Mike and Rachel try to make time to discuss their future. Louis struggles with the rules of his relationship.
Prisoner of war (POW) identification tags found in an abandoned drug house lead Rush and the team to reopen the 1972 shooting of Carl Burton, a former Vietnam POW. Rush learns from Carl's wife, Janet, that he was having trouble adjusting to being home after fighting in Vietnam.