Adam Roberts 
Haven [EPUB ebook] 

Young Forktongue Davy has visions; epilepsy, his Ma calls it. He’s barely able to help around the family farm. But something about the lad is attracting attention: the menacing stranger who might be the angel of death himself; the women-only community at Wycombe; Daniel, sent by the mysterious Guz. They all want Davy for their own reasons. But what use can he be to anyone? He has visions of flight, but how can flight ever be possible in this shattered world? A simple farmboy, caught up in events beyond his power to control-but his visions may be the key to the future.