Who said "Monsters don't sleep. They hunt. That's what they do."?

This quote is attributed to Grover Underwood.

Monsters don't sleep. They hunt. That's what they do. - Grover Underwood

"Monsters don't sleep. They hunt. That's what they do."

Grover Underwood

Character in Percy Jackson: The Lightning Thief

Buy "Percy Jackson: The Lightning Thief" on Amazon

"I'm sorry. I should have been there. I should have protected you."

"I can't believe you're a real demigod. You're like... incredible!"

"The real magic is in your friends."

"Friendship means standing by someone, even in darkness."