Labby, I did not read the Spenser books in order. My library did not have the first couple books so I read them last (asked for them for xmas). Don't drop Spenser if you don't like the first book. I really didn't care about it reading it last. He hadn't met Susan yet, and he could hit the sack also. Parkers' writing got better a couple books in. I like the Jesse Stone books, again don't give up after the first one.
Both authors are fast reading. When I was stuck in bed for 3 months last year, I would read one in under 24 hours. I had my husband running to the library consistently. He told me to read something higher than a 5th grade reading level. LOL I told him these were written for adults.
I hope you enjoy.
Sue