SOLVED. Boy who is immune to magic seeking out revenge on island witch. [s]

[Iram]

The book is about a boy who is immune to magic and is one day cast off his island because his best friend, the island witch, tells everyone. The boy then sails away and ends up becoming a thief hoping one day he'll be able to get his revenge. One day he hears rumors about a knife that is able to steal magic and his journey begins.

[Sarah]

This might be it: Drift & Dagger

[Iram]

Yes that's it thank you so much.