It Was The Cat
Angry and furious, Mittens clawed at Ben and the oven. It was her attempt to capture his attention once again. Her rage must have been triggered by something in this kitchen.
The question is, what? Neither shattered glass nor broken door locks indicated that a break-in had taken place. It was all in place.
In an attempt to understand Mittens, he racked his brains until he finally saw it.