The Copper Gauntlet (Book 2 Magisterium) by Holly Black
During summer break from Magisterium, Call's closest friend is Havoc, a Chaos-ridden wolf. While his Dad secretly thinks that he is secretly evil, Call suspects his Dad is trying to get rid of him and the wolf. Call escapes with his wolf to return to Magisterium, where everything only gets more complicated.
Call, Tamara, and Aaron leave Magisterium to look for Call's Dad who has been accused of stealing, Alkahest a copper gauntlet, used to separate Magicians from their magic. So they begin to search for Call's Dad and the gauntlet, chased by foes unimaginable and dangerous getting nearer to an even more dangerous truth.
If you have not read the first book in this series Iron Trial, I suggest you read it right away...catch up because you will want to read the third as soon as it comes off the press!