Meet Karn. He is destined to take over the family farm in Norrøngard. His only problem? He'd rather be playing the board game Thrones and Bones. Enter Thianna. Half human, half frost giantess. She's too tall to blend in with other humans but too short to be taken seriously as a giant. When family intrigues force Karn and Thianna to flee into the wilderness, they have to keep their sense of humor and their wits about them. But survival can be challenging when you're being chased by a 1,500-year-old dragon, an evil uncle, wyverns, and an assortment of trolls and giants.
The chase continues for the legendary Horns of Osius. Thianna and Karn's quest to retrieve the horns from those who wish to abuse their power takes them to Thica, an ancient land where two tyrant queens reign supreme and where, years earlier, Thianna's mother was labeled a traitor. Soon the two heroes are caught up in an epic battle for control of the kingdom, one that puts their very lives at stake. The only way to overthrow the queens is to beat them at their own game.
Karn Korlundsson is a gamer, not a riddle solver. But in order to rescue his best friend, Thianna Frostborn, he will need to travel to the faraway city of Castlebriar (by wyvern), learn how to play a new board game called Charioteers (not a problem), decipher the riddle of the horn, and tangle with mysterious elves.