The Open Road edition of Topper, by Thorne Smith, is currently free in the US at Amazon, Barnes & Noble, Kobo and Apple. There are multiple other editions available that are not free, but Open Road is a reputable source and I trust they have the legal right to offer it.
The movie and the television series were fun, but the book is much better IMHO. Still very funny, but with an almost subversive edge.
Here's the link to the Amazon deal:
https://www.amazon.com/dp/B09PJ9TGLD
If you regularly buy at another site I assume you know how to find it there. I don't know how long this deal will last.