It's been quite some time since I read Mr. Penumbra's 24-Hour Bookstore. But I really enjoyed it so this short novella was something I wanted to read for a long time.
It's a very fast and entertaining short story about the younger years of Penumbra and how he ended up owning a 24-hour bookstore. Though I'd rather see a complete sequel to the first book, this is a good surrogate.
But I think it very likely that I'd been a bit more invested in the characters had it not been 2 years since I read the first book.
Ajax Penumbra 1969 is the prequel novella to Mr. Penumbra's 24-Hour Bookstore.