“Popcorn” book?

Hey all! Decided to start this year to read 50 classics. While I've really enjoyed it so far- the Dispossessed, Travels with Charley, Count of Monte Cristo, 1984, the Stranger, Fahrenheit 451, and Frankenstein since January- I kind of want a "popcorn book". Something that's not complex but enjoyable and fun before diving into the next read on my list. Doesn't have to be a classic in any sense- just something you really liked and devoured in a couple days. Thanks for your time & suggestions!