She thought it was Reisen or me on the phone and opened the lock.

Hmm. It sounds like a girl's voice, but it's hard to make out. It's pretty quiet, plus there's this rumbling in the background.

That's the sound of the boilers. It's loud even through the door.

Not only did the boilers make the voice hard to recognize, the custodian kappa hadn't actually met us before.

We immediately searched every nook and cranny in the area

but couldn't find the culprit.