Spellslinger by Sebastien de Castell

There are three things that earn you a man’s name among the Jan’Tep. The first is to demonstrate the strength to defend your family. The second is to prove you can perform the high magic that defines our people. The third is surviving your fourteenth year. I was a few weeks shy of my birthday when I learned that I wouldn’t be doing any of those things.

Magic is a con game.

Kellen is moments away from facing his first mage’s duel and the start of four trials that will make him a spellcaster. There’s just one problem: his magic is gone. As his sixteenth birthday approaches, Kellen falls back on his cunning in a bid to avoid total disgrace. But when a daring stranger arrives in town, she challenges Kellen to take a different path. Ferius Parfax is one of the mysterious Argosi – a traveller who lives by her wits and the three decks of cards she carries. She’s difficult and unpredictable, but she may be Kellen’s only hope…