Ronan Truelove barely survived his first encounter with his father and the Bend Sinister. Now, he's determined to become one of the Blood Guard, a sword-wielding secret society sworn to protect thirty-six pure souls crucial to the world's survival.

Eager to prove he's got what it takes, Ronan is sent on his first mission with his friends Greta and Sammy to visit a weird-sounding school and take a series of tests called the Glass Gauntlet. Paper and pencils and nerdy scholarship--where's the life-or-death challenge in that?

But the Glass Gauntlet is actually something much more dangerous: head-to-head competitions against ruthless opponents. Nothing and no one are what they seem. Who can he trust, and who will kill him? Ronan has to figure it out fast because his enemies are multiplying, and soon he will have to pass the ultimate test: facing his father again and standing up to those who threaten not only him and his friends but also the world.