C14 The locked wing

The violet-tinged hum vibrating through the workshop floor rattled the stacks of old ledgers on Corin’s desk. In the corner, the heavy iron drainage pipe shuddered, its metallic ticking growing louder until it began to resemble the frantic beat of a failing clock.

“The resonance is shifting,” Corin said, his eyes darting toward the stone staircase leading to the street-level door