I nominate
The Lightning Thief (aka
Percy Jackson and the Lightning Thief) by Rick Riordan. This the first book of the series
Percy Jackson and the Olympians. The book is apparently targeted at YA or middle-grade readers, but I never let that sort of thing get in my way.
The description from
Goodreads:
Quote:
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Percy Jackson is a good kid, but he can't seem to focus on his schoolwork or control his temper. And lately, being away at boarding school is only getting worse - Percy could have sworn his pre-algebra teacher turned into a monster and tried to kill him. When Percy's mom finds out, she knows it's time that he knew the truth about where he came from, and that he go to the one place he'll be safe. She sends Percy to Camp Half Blood, a summer camp for demigods (on Long Island), where he learns that the father he never knew is Poseidon, God of the Sea. Soon a mystery unfolds and together with his friends—one a satyr and the other the demigod daughter of Athena - Percy sets out on a quest across the United States to reach the gates of the Underworld (located in a recording studio in Hollywood) and prevent a catastrophic war between the gods.
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375 pages (according to Goodreads)
Some example links, but the book has been around for a long while and there are several editions so you may want to shop around (or go to a library). Note that some of these prices are because it is currently on special in some locations:
Kobo US $5.99,
Kobo CA $6.99,
Kobo UK £3.99,
Kobo AU $4.99