In Angel's apartment

Angel and Angela are lying together on the floor near the bed, tangled up in bedsheets and laughing.

Angel: We missed the bed that last time.
Angela: Lucky for the bed.
She kisses him then gets up and walks into the bathroom.

There is a loud noise upstairs followed by muffled shouting. Booth comes down the stairs into Angel's apartment, followed by Wesley, Cordelia and Brennan.

Angel: Can't anyone in this century learn to knock?
Cordelia: (sees Angel undressed and the rumpled bed) Angel? ...Angelus?
Booth: I'm here to get Angela. Where is she? (Looks around worriedly) Kate Lockely gave me the run down on An-gelus here (mispronouncing it).
Angel: It's pronounced An-gel'-us not-- (Cordelia looks worried). I'm just Angel now. (Cordelia sighs with relief) And --
Booth: I don't care what they call you, or what you call yourself. I'm starting to think you're a suspect again. Another victim was found a few hours ago not a mile from here. Why don't we just have a little chat about where you've been the past few nights.
Angel: Hey, I'm feeling some seriously negative energy in here.
Booth
: You take my advice. If you don't answer my questions, I'll take you down to FBI headquarters in handcuffs.
Brennan: He'll do it. He doesn't like you.
Cordelia: (to Booth) Okay, you get to leave now. You're not gonna come in here and accuse Angel like this. I don't care how many files you have on all the horrible things that he did back in the powdered wig days. He's good now. And he is my friend.
Angela: (coming out of the bathroom in a towel) And he's a damn good--kisser. Anyway, Angel didn't go anywhere, he's been here with me for hours (she smiles at Angel)
Angel (looking slightly embarrassed): Cordy, calm down, I can handle this. Look, Silly, I'm trying to help out here and I think after you see what we've come up with, you'll appreciate our help.
Booth: It's "Seeley" not "Silly!"
Angel: I'm not sure I get the difference.

Brennan hides a snig-ger, not very successfully. Booth glares at her

Brennan: Come on back to the lab, Angela, we're ready for the 3D reconstruction.
Angela: Now??? Well, I think Angel and his team should tell us what they've figured out too.
Brennan: I think she's right.
Booth: (glares at Brennan, then at Angel) OK, Darth Vampire, bring your buddies down to the lab and we'll go over all the evidence. But put some pants on first.

-----------------------------
It's early the next morning. Booth, Brennan, Angela, Cordelia, Wesley and Angel are in the FBI lab, they've worked all night on their analysis and theories.

Cam enters the lab.

Brennan: Great Cam you here just in time, why don't we recap everything we've come up with so far. Let's go over the forensic evidence first, followed by Angela's 3D analysis.
Cam sits down next to Booth
Cam: (very quietly to Booth) I was looking for you last night...
Booth: (also very quietly) We were here, in the lab, all night.
Brennan: (clears her throat very noisily in their direction) Can we get started?

Cam: (stands up) I got some saliva from wounds on all of the victims. I was able to isolate the same properties from all of the victims. I'm pretty sure we're looking at the same perp for all the deaths. But I not able to do DNA testing. I took a look at the DNA, but I'm not able to compare to database because there are some odd elements I cannot identify. I can't even tell if it's male or female. I have no explanation for this--
Angel: We do-- (Booth gives him a look) when its our turn, that is.
Angela: OK, now from my analysis of the wounds, I've ruled out animals with fangs like a wolf or a dog. The arch is completely different from the animals in the database, and there are no marks from the lower teeth. I have determined that all the bite marks were made by the same mouth. (She fires up the Angelator and show some scenarios of how the victims were bitten.)
Based on the angle of the bites...I'm having some trouble re-creating exactly how the biting would take place. Angel, can you help me out here? (she smiles at Angel).
Angel: (smiling back) Sure, let me demonstrate.
He pulls Booth out of his chair and mimes biting his neck.
Booth: Hey, get your teeth off of me!
Angela: Teeth? No, that's not gonna be accurate. (to Angel) You know what we need.
Angel: (apprehensively) Grrr???
Angela: (nods) Show us some fang, baby.
Angel: I don't want to.
Angela: Sweetie, this is for reseach...for me?
Angel: (resignedly) OK. Grrr! (transforms to vamp face)
Booth: (terrified) Aaaaaaahhhhhhhhhhh!
He tries to run, but Angel still has his hands on Booth's shoulders so he can't.
Cam jumps up, scared, and moves to the other side of the room.

Brennan: Booth, stand still, we need to take some measurements here. It's all part of the research process! We have to recreate the killing.
Booth: That's easy for you to say, you don't have Dracula ready to suck your blood!
Angel: I said, don't call me Dracula! Grrrr! (menacingly)
Booth: (trying to laugh) Down boy?
Brennan: Cam, can you please help me with these measurements?
Cam: You work so much better on your own...
Brennan: Angela?
Angela and Brennan take the necessary measurements. Angel de-vamps.
Angela: OK, let me rerun this data here, based on that excellent demo (smiling at Angel)... and taking the height of the victims into account, I think we can prove that the killer is either an average-sized woman or a short man. That's all I've got at this point.

Wesley: (mockingly) Agent Booth, would you like a moment to compose yourself? (Booth glares at him). Now from my research, and the fang marks Angela has processed, I am convinced a vampire is responsible for biting the victims and draining the blood.
Brennan: (mumbling) Draining the blood? The blood-- (shakes her head, trying to recall something)
Wesley:The evisceration was a new element, but based on our own experience, combined with--
Angel: Wesley, the punch line?
Wesley: Right, a burrower demon, well, burrows into a victim or host's body until it has used up a person's, uh nourishment, then it looks for a new host. I believe that somehow a burrower demon ended up in a vampire's body. Because the vamp continually replenishes his blood supply, the demon didn't need to find a new host, but something it needed was missing. My theory is that as the vampire feeds on the victim's blood, the burrower sucks out the person's insides, providing the missing nutritional elements. The burrower never needs to find a new host, so it just stays in the same body all the time.
Brennan, Angela and Booth look sick to their stomachs. Cam is staring at Angel, ignoring Wesley's explanation.

Cam: OK, assuming we believe any of this vampire/demon stuff, where does this get us?
Booth: Excellent question, Cam! (turns to Wesley) All your supernatural clap trap and your (turns to look at Brennan) forensic whochamacalit technology and all you can do is explain how these people died. What we really need is to find out why so we can track down the murderer and solve these crimes. Crimes are not solved by scientists. They're solved by guys like me asking a thousand questions a thousand times. Catching people telling lies every time. You're great at what you do, Bones, but you don't solve murders. Cops do.
Brennan: I'm pretty sure I've heard that speech somewhere before.
Booth: (ignoring her) Step one: Know your victims. The killings started the same day this conference started. I turned up that 3 of the 4 victims were forensic researchers, except for the first one, she was a cheap hooker.
Brennan: Are you saying the killer is someone at the conference with us?
Booth: That's exactly what I'm saying.
Angela: We'll some of those people are really peculiar, but are they killers?
Brennan: No, I can't believe that. What about the prostitute?
Angel: He was practicing.
Booth: That's my take on it (looks at Angel with a hint of respect, a very small hint, a teeny tiny hint)
Angela: So can we figure out who's next?
Booth: I did some digging on employment history There's only two people at the conference who worked with all three of the victims. I'll talk to both of them and then follow them around this evening and see what they are up to.
Brennan: Who are they?
Booth: I think you should leave the rest of this up to me---
She grabs the list from him, takes a look and then looks back at Booth
Brennan: No! This can't be possible. I refuse to believe this.
Angela: (grabbing the list) Who is it? (in a disappointed tone) Oh, no, no!
Cam takes a look at Booth's list but remains silent.

Zack comes in.

Cam: Good morning, Zack. Where's Hodgins?
Zack: He isn't coming into the lab. He's still sleeping. He woke me up when he came in last night, or rather, very early this morning.
Cam: You're sharing a room?
Zack: No, a suite. We're sharing a suite. The accomodations the Jeffersonian booked for us didn't meet his high expectations. So he got a suite and let me have one of the rooms.
Cam: I don't want to see you claiming any hotel bills on your expense report...
Brennan: Did he say where he was, last night?
Zack: He said he'd been with an old co-worker he hadn't seen for a while, "catching up" is how he put it. And as for this case, he said he might be a conspiracy theorist, but that doesn't mean he believes in any of this vampire "stuff" allthough he used I word I won't repeat with females around.
Brennan: I think we've done all the analysis we can with the evidence. let's all take a break for the rest of the day. We've been working all night, well most of us, (glancing at Angel and Angela). Get some rest, go to seminars, or whatever. Let's meet back here this evening.

Angel and Angela look at each other, say "whatever", then quickly leave together.

Zack: Did I miss something?