Premise: What if Richard Castle wasn't an only child? I recently saw an episode of Bones that presented a character who grew up as an only child only to find out he really had an older brother who was, essentially, raised in a mental hospital. What if Richard's parents had a similar situation and Castle never knew he had an unstable brother. What if he was a twin? What if he escaped?

Warnings: Kink, BDSM, Master/slave, Sexual relations, Non-con, Rape, kidnapping, and general disturbing content. Seriously. This is disturbing and really dark fic that's not for the faint of heart. This is the only warning you're getting. I know this type of story isn't everyone's cup of tea but I wrote it because it was clawing at me to be written so if you don't like it based solely on the fact that it's dark fic then please don't review or comment. If you have specific feedback I'm always interested.

A/N: For those with an especially keen eye and are well-versed in Stana Katic and various other TV shows you will find some Easter eggs scattered about. Feel free to hunt for them ;-)

Detective Kate Beckett was a beauty that I got to watch blossom. Not that she knew I was watching, mind you. In fact, I was watching someone else entirely but as fate would have it he led me to her and I am ever so grateful. When I first saw her in a pair of pants that hugged every curve, her black leather jacket opened just enough to see the white tee-shirt underneath that clung to her breasts and her long blonde-ish hair with the subtle waves towards the end I knew she was just as fierce as she was beautiful. The sheer determination that shone in her eyes as she canvassed a crime scene made me realize just how special she was… And smart. She was a challenge and I'd have to bide my time carefully but I didn't mind. The more I watched her, the more I saw the tribulations she overcame, the more my desires drew and it made every moment I had to wait so much sweeter. It also made me realize just how air-tight my plan would have to be in order to make everything come together. So, I watched her… but I also watched him. He was actually the key and without him my entire plan would be destroyed.

I watched and I planned for two years and finally he finished his book and it was scheduled for publishing. It was only a matter of time before he'd have to go off on a press junket that would take him across the country, even possibly around the world – he was an international bestselling author after all. It was finally the opening that I needed and it would give me ample time but the one problem I couldn't seem to figure out how to overcome is their phone communications. I watched him disappear before and it seemed like there was absolutely no contact between them but what if, on the off chance, he called her. She would know instantly that the man before her was not the same one she loved and trusted and I'd be sent back. It was hard enough getting out of that place the first time. No, there would be no going back for me. I'd rather die than return to the stark white prison that held me for my whole life. It wasn't fair! I was owed this life and it was stolen from me and I am hell-bound to take it back by any means necessary. I wouldn't be able to spend as much time with her pretending to engage in her daily life as I'd like – my trickery would have to be swift but not too quickly so as not to make a mistake.

Soon….

I studied his mannerisms and whenever possible I got close enough to listen to their banter and how he spoke. I heard some of his hair-brained ideas and wondered if they sent the wrong brother to the insane asylum. I watched as he interacted with his family, a family that I was so denied. I'd have to be especially careful to make sure I appeared carefree and, dare I say, almost child-like in order to match him. I could do it, I wouldn't have to keep the ruse up for long… just long enough.

Finally, my time was nigh as I followed behind their car as my beloved Kate Beckett drove him to the airport. It was so close but I still had to wait, but only a short while longer. I couldn't appear too soon after his departure as it would raise suspicions but I did manage to get his touring itinerary from his website, an itinerary the Detective has as well, no doubt. This allowed me to see when there was any lag between his engagements and would be the perfect opportunity to explain his sudden reappearance. I had about one week before such a lag would occur and that was all the time I needed to finalize the remaining aspects to my plan. The plan I built over the course of years and was surely going to be fool-proof… or should I say "Beckett-proof," since she has thus far managed to overcome every obstacle in her life. That tenacity just made me love her so much more.

The first part would be incredibly easy even though this is normally the hardest part. But I had an ace up my sleeve that would make luring her out of the precinct, alone, and under my control as easy as taking candy from a baby. Making sure she wasn't found and keeping her under control would be the hardest part. While she was hard-headed and determined her team was equally fiercely protective of her and would, surely, never give up looking for her or hunting down the person who took her. Especially once he got word of her disappearance. He was the most stubborn of them all but more importantly, he had access to incredible resources that would give him and Beckett's team an added edge. I contemplated taking her far away to make it more difficult for the NYPD to track her but I had no illusions that the kidnapping of a police officer would immediately alert the FBI and other police departments would make her case a priority as a sign of respect for a fellow officer regardless of jurisdiction. So, why not do the next best thing and hide her plain sight… right under their noses… literally.