With Vargas promising to keep them apprised of updates should his team find any more signs of Esposito's whereabouts; they'd headed over to the VSN center, ready to tear the place apart in hopes of finding enough evidence for a successful arrest.

Short one man, they'd assigned a team of unis to take CSU to Lafayette's house on the northside of town, doing the same there.

Castle could feel the tensions rise to unbearable levels when they pulled into the parking lot in front of the clinic, his vivid memory recalling their last visit there, and the apparent chaos their arrival had caused.

It also put a whole new spin on the old man calling him the angel of death; obviously not talking to him but Esposito.

That in turn meant that the detective had been seen at the place several times prior and something had happened that led the other patients to understand that he'd been compromised. It even went along with Lafayette's cryptic message for Esposito to remember his numbers, more than likely referring to the code left on the detective's answering machine.

Feeling a chill run down his back at a case that was providing some excellent thriller material if it wasn't so nerve-wrecking; Castle followed Beckett and Ryan up the concrete walkway and past the dilapidated door to the reception area, where Marianne, the angry gray-haired lady stared back at them in undisguised annoyance.

"You're here again?", she sneered, her stern expression softening somewhat when Beckett waived the warrant in front of her face.

"Ma'am, we're going to have to ask you to step aside while we search your work desk, as well as Doctor Lafayette's office."

Beckett's voice was stern, her gaze following the older lady intently as she grumbled something under her breath that sounded an awful lot like insults.

"The doctor is currently in session; you're going to have to wait."

"I am afraid that won't be possible. He's going to have to reschedule his visit.", Ryan countered and headed to the wooden door off to the side, before knocking three times.

It didn't take long when heavy footsteps approached, Lafayette's crimson face turning into an annoyed grimace upon seeing them.

"What is it now?", he asked curtly, "Can't this wait? The world doesn't revolve around you guys."

"It does today, Doctor. We have a warrant to search your entire office. Your house is being searched as we speak."

"On what grounds?"

"Suspicion of murder, kidnapping, drug trafficking, assault, conspiracy to commit murder…I can go on if you'd like…", Beckett responded and joined Ryan, staring up at the doctor who towered above her.

"I already told you I have alibis for your murders."

"And we know that you have your alibis. But we also have proof that you drugged and kidnapped Detective Esposito from the Cloudy Minds nightclub the week before last and that you paid Chantal to slip the drugs into his drink. We also know that you have an extensive history of coercing people in your care to do things against their will by use of drugs and hypnosis, which is what you did with him. That's why your voice was on his answering machine relaying a code that you programmed into his mind to get him to act on your behalf. Your noble crusade to cure PTSD is nothing more than brainwashing and murder wrapped in pretty wrapping paper, Doctor. You have used defenseless human beings to experiment on. And it's going to stop now."

"You don't know what you are talking about…", he claimed, backing up and trying to shut the door on them only to have Ryan slide over his foot to keep it open.

"We already know you stole the meds needed to alter a patient's mental state from your last place of employment. We also know that Harrison was helping fund your tests, trying to get in on a project that you could make millions of dollars on if only you could perfect your version of DMM, the perfect weapon for anything from corrupt communist regimes to suicide bombers. But you know what? I think Harrison caught onto you, and once he realized just how you were coming up with your scientific breakthroughs and who you were hoping to sell the technology to, he threatened to expose you. So, you had him killed, which ironically enough served as another test run for your latest human project. Who would care if something went wrong and Esposito got caught, right? His DNA would be all over the place, he wouldn't be able to remember anything that could get you indicted, worst case, it'd be his word against yours. And we know how that would turn out. It's the perfect criminal scam. Then came Anderson, another one of your test subjects. He caught onto you once the drugs you put into his system began to wear off. He said he was done and threatened to go to the cops. So, you had him killed as well. Who's going to be next? Who did you program Esposito to kill next!?"

"It's a pile of circumstantial bull."

Ignoring his posturing, Beckett stepped into his office, startling the older man sitting in the guest chair by his desk, before pointing an angry finger at Lafayette's chest.

"Well, in that case we shouldn't be able to find anything in your office or apartment that could tie you to these experiments or a missing police officer, now should we?"