https://en.wikipedia.org/wiki/Garrett_P.I.

That link is dicey. I'm not sure why, but it doesn't always land in the correct page. It usually ends up in a disambiguation page.

Goodreads is commercial, but it does a good job of describing books and series of books.

[UPDATE] Ah. Figured it out. It's the trailing period. I think HN removes it from the link.