The Quest for the Luminae

Thirteen-year-old Milo lives beneath the earth.
He works as a bounty hunter's apprentice in the Underground of Aetror. Along with his master, Rod, he tracks criminals through dark tunnels and does his best to not get killed. He dreams of an apprenticeship to a baker, or a carpenter... or anything safer than this.
Milo has never been aboveground. He's never seen the sun, the clouds, or the sea, and he's happy to keep it that way.
The king of Aetror summons Milo and Rod to the palace. He orders them on a quest for the luminae, mythical creatures with healing powers. For the first time in his life, Milo must leave the Underground. They must find the creature, return with it, or they will be executed. No one has ever seen the luminae and all other quests to find them have failed.
When circumstances separate Milo and Rod, Milo is left on his own. He must continue the quest... and find a creature that doesn't exist.
Fans of quests, mythical creatures, and reluctant heroes will love this first installment in the Underground of Aetror series.