When Thalia Grace crash‑lands back at Camp Half‑Blood after a mission gone sideways, she expects monsters, drama, and maybe a lightning‑induced migraine. What she doesn't expect is landing directly on top of Nico di Angelo - who was very much minding his own business, thank you. Somehow, the two most emotionally constipated children of the Big Three get stuck together on a quest that absolutely no one thinks is a good idea. Camp panics. The gods panic. The Stolls start taking bets. And through storms, shadows, bickering, and a prophecy that definitely should've been proofread, Thalia and Nico discover that maybe the only thing more dangerous than monsters... is caring about someone who understands the darkness in you.