The way Integra lets her investigating agents work - relative free rein of their time - it is not immediately apparent that Mabel is, in fact, missing. She notes it, like she notes every instance of not seeing someone when she expects them in passing, but the reality is that cases are difficult and cases are long and sometimes, people just don't come in for a few days, either to sleep it off or because they're that entrenched in work.

She reminds herself to ask after the other woman, calls and hears nothing back, then gets busy, and then it's to the point where she's the only employee who hasn't checked in on a mandatory callback. When Integra looks up just how long it's been, and notes that Mabel's CiD is still apparently functioning, she decides it's time to go looking.

Integra and Dean walk there, hour and politeness be damned, and even from the courtyard she can tell something's amiss. "Her windows look blacked out," she says, half to herself - it's not as if she imagines Dean could miss it.