Lost Hero, The (Heroes of Olympus, The, Book One)

Jason Has A Problem. He Doesn't Remember Anything Before Waking Up On A School Bus Holding Hands With A Girl. Apparently She's His Girlfriend Piper, His Best Friend Is A Kid Named Leo, And They're All Students In The Wilderness School, A Boarding School For Bad Kids. What He Did To End Up Here, Jason Has No Idea—except That Everything Seems Very Wrong.