I remember reading a fic where the team has an undercover op to find a murderer that drugs men in the bar, rapes them, and then kills him. They send Ryan and Espo in, Espo being bait because she usually goes for cocky ex-miliatry men so as Espo is playing the part on the dance floor, Ryan stays by the bar and keeps an eye out on his partner. But then it turns out she targets Ryan instead, drugs him, and drags him from the bar. Castle noticed Ryan hasn't been speaking on the microphone and lets everyone else know. And they have to find him as she almost rapes a drugged Ryan.
i hope I did this right because this is my first ever post on lj so yeah...sorry if I screwed up