Book excerpt: David Gershwin's summer is about to take a turn for the weird. When his dad's new patient Zelda tells him shes from outer space and on a quest to take Johnny Depp back to her planet, he knows he should run away screaming. But with one look from her mean, green eyes, David's hooked, and soon he's leaping across rooftops, running from police, and stealing cars just to stay by her side. He might not be a typical hero, but David's going to get the girl even if it takes him to the ends of the earth—or beyond.