It's an ordinary early autumn night in New York: chilly; not uncomfortably so, yet, but promising to get colder as the season wears on. A scruffy, long-haired vagabond emerges from the shadows in the alley behind a clothing store, unhesitatingly enters the passcode to disarm its security system, quickly picks the lock, and goes quietly in.
After a couple of hours she gets a message.
<PennyLane> We've arrived, everything's alright
<argylecape> Cool.
<argylecape> They're still watching your building.
<argylecape> I'm going to head back to where I found Dr. Montgomery soon if nothing interesting happens.
<PennyLane> Okay
<PennyLane> They probably won't get worried until we don't come back tonight
<argylecape> Good point
<argylecape> And I'm pretty sure he's not there right now; he wasn't when they called. I'll hang out here.
She takes a nap after dinner and hangs around for a few more hours after that, until it's late at night.
Eventually one of them does call Montgomery. He is Not Happy, and he tells them to find a way to verify whether the Yates are in the apartment without giving themselves away. They debate and decide to pretend one of them is a deliveryman. They are terrible at costumes and forget to get an actual delivery box. This would've been disastrous if the Yates had actually still been living in their apartment but they are in fact not. Montgomery is even less happy about this fact.
She takes notes of the addresses - why not - and follows one of the guys, since Montgomery is still at the office rather than the lab.
Hopefully they're not freaking out too badly? But she's not answering regardless.
The amount of freaking out is increasing with time. Sadde tries calling her.