The Mark of Athena (The Heroes of Olympus, #3)

by Rick Riordan

Percy smiled at her—that sarcastic, troublemaker smile that had annoyed her for years but eventually had become endearing. His sea-green eyes were as gorgeous as she remembered. His dark hair was swept to one side, like he’d just come from a walk on the beach. He looked even better than he had six months ago—tanner and taller, leaner and more muscular.

She’d secretly had a crush on him since they were twelve years old.

Piper wondered how Annabeth ever won an argument with this guy.