"Did anyone get an inheritance?" Jon asked, hoping that even if he hadn't, someone else in his family had.
"Yeah, I think Mikey did. It was a small box. But he never told me what it was," Zoe said.
From the description, Jon figured that it must have been the box that contained both the stone and letter from his grandfather.
He had to get the stone back. Who knew what his little brother would do with it?