Dr. Calder from the CDC is back, and she stands over the sick kid while Rosen and Nina watch. They're amazed as he seems to calm down when Calder takes his hand -- and then gets worse again when she lets go. So it's Dr. Calder? It must be, because why else get Lindsay Wagner? As she holds both Dave's hands, Rosen explains about oxytocin, the "love hormone," which is what the contact is causing his brain to produce and counteract some of the toxic effects of the cortisol. He calls for some more of the hormone, and while Calder takes off to get something, Rosen explains that their Alpha must be a serial killer who forms a bond with the victims then severs it. Right on cue, Dave flatlines, because this is all just too stupid to live through.
Over at the bereaved mom's house, Rachel tells her that they're still working on it. When David Burton's name comes up, the mom starts going on about how her late son was bullied, cyber- and otherwise. Now they have a little time to kill, so Rachel decides to hang out for a snack all friendly-like. Which makes it official: Rachel is the last person to realize Jessica's the Alpha.
Bill and Cameron check out the accident site, which doesn't seem to have any of the normal signs of an accident. Which, after Cameron replays the crash in his head, he declares it wasn't.
Back at the hospital, Dave appears to be stabilized. Dr. Calder is curious about how Rosen and his team figured it out, but he's not sharing, so she takes her leave. Thanks for playing, Lindsay Wagner! I'm still not watching you on Warehouse 13! Dave wakes up and wants Rosen to "tell her I'm sorry." That's all he gets to say before he's out again. Just then, Bill and Cameron call from the accident site, explaining that Chris's death was a suicide, caused by the bullying and covered up by the sheriff. So it looks like they have an Alpha, and they belatedly realize that Rachel's at her house. They could save a lot of effort solving these mysteries by just letting the most vulnerable members of the team wander around until they're alone with someone, and that's who it is.Case in point, Rachel is currently opening up to Jessica about her super-senses, and what a burden they can be, especially where her unsupportive parents are concerned. She thinks even Rosen only cares about her Alpha abilities. "The only thing I'm good for is being a walking crime lab," she whines, like that's not really handy. Just then her cell phone rings with a call from Bill. She's about to get it when Jessica puts a supportive hand on her shoulder and says it can wait. "I'm here for you" she says, pulling her into a hug. Rachel glows orange all through it, and even after it, but this time she feels great. She's totally popped a Boehner.