What is that book you “discovered”, and were really pleasantly surprised by?

Like some old book at a antique store collecting dust you gave a try for some reason.

For me it was Lives of the Monster Dogs (1997) by Kirsten Bakis. I was a teenager when the paper back came out. I was intrigued by the realistic dog in a smoking jacket on the cover. Then the first few paragraphs grabbed me and I bought it.