Boy finds/gets a dragon egg/polished rock, and it hatches. I think the young one is named Vincent. An adult male dragon somehow learns of the (very rare) hatching and comes to reclaim the baby, who can't really talk yet. The adult male is green, and is careful not to be seen by humans (one scene he's hiding in the pine tree foliage near the house). It's NOT Jeremy Thatcher, Dragon Hatcher.