What is a book that you basically stumbled upon by mistake, but ultimately ended up being one of your all-time favorites?

For me, it was All the Ugly and Wonderful Things by Bryn Greenwood and Two Girls Down by Alice Vega. I had never heard of either of them, or their authors. I was just scrolling through the Libby app one day and happen to come across them. Now both of them are on my all-time favorites list. So what golden treasures did you guys find by complete accident?