Name a Book That Totally Immersed You

I remember one time, sometime during college, I was at the airport ready to fly from Turkey to Germany. I was an experienced traveler even then and I prided myself on it. I arrived at the gate well ahead of time, everything neatly packed in one small bag, boarding pass ready. I picked a seat, settled in, and started reading.

Some time later, I looked up to see everyone lining up to board, except they were one gate over, boarding a flight to Bahrain or somewhere. But all my people were gone. I went to the customer service desk and learned that my flight was gone, and in fact they’d called my name several times, all while I was sitting at the gate, immersed in my book.

The book was Harry Potter. Wish I could remember which one—maybe Goblet of Fire, but I’m not sure. What about you? When has a book totally immersed you? What was the book? What drew you in about it?