Castle and Beckett uncover a prostitution ring after Assistant District Attorney Jack Buckley’s murder.
- Bitch in Sheep's Clothing: Scarlet paints herself as the victim of multiple powerful men, but orchestrates their deaths so she can take over their call-girl ring.
- Call-Back: Ryan is called honey-milk by Esposito's friend.
- Chivalrous Pervert: Castle towards Scarlett. He is clearly attracted to her but when she shows up at his house beaten and emotionally vulnerable, he rejects her advances and takes her to the hospital.
- Femme Fatale: Scarlet is ultimately revealed to be behind everything. Her attempts to seduce Castle are just a means to throw him off.
- Hired to Hunt Yourself: DA Buckley ran the prostitution ring he was responsible for trying to shut down.
- Hypocritical Humor: Why doesn't Castle just ask Alexis what she talked to Beckett about? Because cool dads don't do that! They ask Beckett!
- Smug Snake: Scarlet is smart... but she's not as smart as she thinks she is.
- Wounded Gazelle Gambit: Scarlet pretends to have been beaten and threatened by her pimp in order to get the opportunity to kill him and take over the call-girl ring.
