Dragon tender : Fae Unbound Teen Young Adult Fantasy Series, #3

Seventeen-year-old elf Avenall lives a solitary life as a Dragon Tender. He has no family left but the dragons. When he learns the elves have plans to use them as weapons against the humans, he steals them and crosses the ocean to warn the Queen of the Fae. Queen Lizbet welcomes him warmly because he has a face she recognizes from long ago. But will his help be enough to prevent an elvin war and the destruction of human technology?