Request #129

I’m trying to find a book I read several times as a kid, but can’t remember the name or author, lol. It’s about a boy staying in San Francisco with a grandfather? Uncle? who needs $$$. The kid finds money tucked into a book or books in the grandfather’s library. So vague,  but I’d really like to find it. There’s a lot of information about the earthquake as well. Mystery at Thunderbolt House by Howard Pea