Aidan disappeared for six days. Six agonising days of searches and police and questions and constant vigils. Then, just as suddenly as he vanished, Aidan reappears. Where has he been? The story he tells is simply...impossible. But it's the story Aidan is sticking to.

His brother, Lucas, wants to believe him. But Lucas is aware of what other people, including their parents, are saying: that Aidan is making it all up to disguise the fact that he ran away.

When the kids in school hear Aidan's story, they taunt him. But still Aidan clings to his story. And as he becomes more of an outcast, Lucas becomes more and more concerned. Being on Aidan's side would mean believing in the impossible. But how can you believe in the impossible when everything and everybody is telling you not to?

David Levithan is an award-winning and New York Times bestselling author of young adult books, including 19 Love Songs, Every Day, Boy Meets Boy, Nick & Norah's Infinite Playlist (with Rachel Cohn) and Will Grayson, Will Grayson (with John Green). He lives in New Jersey and spends his days in New York, editing and publishing other people's books.

'Levithan's warm and conversational voice is likely to disarm even the most hard-hearted, drawing them into the loving worlds of his carefully observed characters.' Good Reading