The sound wasn't the crunch of crumbling plaster. It was the sound of a knife sliding into a sheath. The wall seemed to swallow the metal blade. Elias frowned, pushing deeper. He expected to hit the wooden lath or the brick chimney behind it.
The house on Oakhaven Drive was a greedy thing. It had swallowed three generations of the Miller family, and it was hungry for a fourth. vertical crack above window
A shadow moved behind the glass, long and thin, stretching from the window frame upward. The sound wasn't the crunch of crumbling plaster
If you’ve determined the crack is cosmetic, you can fix it using standard DIY methods. How to Repair Cracks in Plaster Walls | Ask This Old House long and thin