There's a pointless scene where Rachel's mom harangues her in their apartment about her "condition" and not being single forever. I think it's just to underline that situation and let some time pass. That much accomplished, Gary calls Rosen from home to report that he's located their wanted Alpha and is tracking her movements. The rest of the team arrives at the appointed street in the Alphamobile and follows Rachel's nose down a pheromone-redolent alley, until she gets a snootful of cigarette smoke from a clubgoer and loses the scent. Bill has everyone split up, taking Hicks with him, because splitting up worked out so well last week. Rosen gets on his phone and wakes up a protesting Gary to walk him, Rachel, and Nina through the pursuit. Rachel spots their quarry at a ridiculous distance with her super-senses, but the girl runs into a youth hostel. Rosen calls Hicks and Cameron in, and seconds later, rioting youths spill out onto the sidewalk. So at least they know they're on the right track. Rachel warns the team to stay away from the spreading pheromone cloud, and as Tracy runs across the street, they lose her -- only to be distracted by the dude in the blue hoodie she was trying to get away from, both just now and in the opening scene. Upon being recognized, he bolts too, but Hicks stops Blue Hoodie's panicked sprint by...stepping on his shoelace. Meanwhile, Bill is still pursuing Tracy down an alley, but then loses her in a street full of cabs. Rosen talks to Blue Hoodie man, who realizes that they know about Tracy's "thing." He claims to be her brother, and also immune to the effects. He adds that he's been looking for her for months. "I'm the only one who can stop her." So when does he plan to start doing that, then?