The Lightning Thief
by Rick Riordan
Annabeth's mom is really cool. She is the Goddess of Wisdom and is Zeus's daughter. We know that she and Poseidon don't get along very well: Athena once caught Poseidon and his girlfriend at the time, Medusa, getting busy in her sacred temple. Athena helps Annabeth get to safety when Annabeth runs away from home at the age of seven. Athena also gave Annabeth a magical Yankee's hat that allows Annabeth to disappear when she wears it.