They left the police station, and got into the SUVs. Hotch and Rossi got into the first one, Morgan and Reid got into the second one, and JJ, Prentiss, and Greer got into the third one.

Hotch asked Rossi, "How did our trainee do on her first day?"

"She did okay. She asked some good questions and didn't do anything stupid. That's about as good as you can hope for," answered Rossi, with a smile.

Hotch said, "Glad to hear it. I hope this lead with the syringe works out. If it doesn't, we're back to square one and that makes it more likely he'll find another victim before we find him."

"We'll find out tomorrow, one way or the other," Rossi responded. They spent the rest of the ride discussing who was going to go where the next day.

In the second SUV, Morgan looked at Reid and said, "How was your day with Agent Greer? You looked like you were getting along with her well when Prentiss and I showed up."

Reid sighed and tried not to give Morgan the reaction he was hoping for. "Yes, we got along fine. She's an intelligent, capable woman who is going to make a good agent. She asked intelligent questions, and when she had knowledge that would help, she didn't hesitate to say what she knew in an informative manner." Reid thought his response would be impersonal enough to get Morgan off his case.

Morgan chuckled. Reid closed his eyes and hoped Morgan wasn't going to continue needling him. "So, kid, you spent the afternoon with an attractive woman, and that's the best you could say about her? "

Reid thought to himself, 'Does he really want me to tell him I watched the way her eyes crinkled at the side when she smiled? Or that I noticed her habit of tucking her hair behind her ears, or that she really has a gorgeous…backside when she bent over to look at something by a dumpster? I don't think I want to tell him that'

"Yes, she is attractive. But I think the most important issue is that I think she'll make a good agent. Really, Morgan, you let physical attributes distract you too much." Reid returned, and hoped it would make Morgan leave him alone.

"Okay, kid, I'll agree that she's smart. But you're not letting yourself appreciate the whole picture if that's all you notice." Morgan responded.

Reid desperately tried to change the subject. "Did you and Prentiss hear anything from the neighbors that might suggest why he choose those victims?"

Morgan knew what Reid was doing, but he decided he would stop teasing him. "Besides that they all lived alone and worked late, they didn't seem to have a lot in common."

They talked about the victims the rest of the ride.

In the third vehicle, Prentiss looked back at Lia and said, "So, how would you say your first day on a case went?"

"It really was great! I learned so much. I might have learned the theory at the academy, but seeing it in action is completely different. Agents Rossi and Reid were very patient in answering my questions," she responded. She kept to herself that she found Spencer Reid interesting in more than a professional manner.

"You're information about the syringe might be what breaks the case for us. I'm glad we had you along for this," said JJ.

"I was hoping my medical knowledge would be helpful," replied Lia.

She asked them, "what should I expect tomorrow?" They spent the rest of the ride talking about the next day.