A key subplot in the series is the relationship between Annabeth, Percy, and Luke. Luke is Annabeth's hero and one of her first half-blood friends. Annabeth likes Percy, which she hints at, but she still has feelings towards Luke. At the end of "The Last Olympian", Luke shows slight feelings for her, sort of like an older brother. These feeling are present despite the fact that Luke and Percy are arch enemies and he has attempted to kill Percy many times. In "The Sea of Monsters", it is shown that one of her life's wishes is to save Luke from Kronos.