Happenstance Found (Books of Umber)

Catanese (the Further Tales Adventures) dazzles in the first of the planned Books of Umber series by wittily subverting genre tropes. Happenstance, a boy with strange green eyes, wakes up in a cave with no memories of who he is or anything about the fantastic world in which he lives. He soon encounters Lord Umber, an adventurer who seems familiar with our world as well as his own, and his two companions—a brute cursed to be forever truthful and a one-handed artist and archer. Ages 8-12.

The End of Time (Books of Umber)

The adventures of Happenstance and Umber reach their epic, surprising, and emotional conclusion. As Happenstance struggles to master his unusual abilities, he realizes that time is running out — because Umber's rivals threaten to undo all the good he has achieved, while an unexpected new enemy with terrible destructive power approaches the kingdom.