He understood how dangerous oaths could be. But Leo didn't care. "I'm coming back for you, Calypso," he said to the night wind. "I swear it on the River Styx.

Swords can’t solve every problem.

Hazel frowned. "Why that one?" "You don't see the ghost?" Frank asked. "Ghost?" Nico asked. Okay... if Frank was seeing a ghost that the Underworld kids couldn't see, something was definitely wrong.

My goal in the classroom was always to make sure they were having so much fun that they didn't realize they were learning.

If you've seen a crab's mouth, all foamy and gross with whiskers and snapping bits, you can imagine this one didn't look any better blown up to billboard size.

What did he say?" Hazel asked. "With the cussing removed? He said he can get us to the top," Percy replied.

Life is only precious because it ends, kid. Take it from a god. You mortals don't know how lucky you are