The grid turned gray. A number appeared:
Elias walked upstairs. His father was waiting in the car, the engine running, exhaustion pulling at the corners of his mouth. Kumon Solution Book Level M
“I didn’t—I just opened a book—” The grid turned gray
The fluorescent light above him flickered and died. The basement went black. When the emergency backup hummed to life, Elias wasn't alone. the engine running
The final blank on the paper said: Solve for E.