I looked at Thalia. "You're afraid of heights." Now that we were safely down the mountain, her eyes had their usual angry look. "Don't be stupid." That explains why you freaked out on Apollo's bus. Why you didn't want to talk about it." She took a deep breath. Then she brushed the pine needles out of her hair. "If you tell anyone, I swear—" No, no," I said. "That's cool. It's just… the daughter of Zeus, the Lord of the Sky, afraid of heights?