Short book recommendations

Currently reading two fairly long books – one fiction (American Psycho) and one non fiction (Cultish: The Language of Fanaticism). I am 17 books into my 20 book reading challenge but would like to boost this number to 25 – anyone got any good short books I can read to get to this goal quicker?

I know the point of the Reading Challenge isn't to read loads of short books but I have read quite a lot of big books this year and looking for something short whilst I read two quite heavy books. Something like 'All my Friends are Superheroes'.

Thanks in advance! 🙂