Veiled An Alex Verus Novel from the New Master of Magical London by Benedict Jacka

REBEL NO MORE
Alex Verus is a mage who can see the future, but even he didn't see this day coming. He's agreed to join the Keepers, the magical police force, to protect his friends from his old master, the Dark Mage Richard Drakh.
Going legit was always going to be difficult for an outcast like Alex, and there are some Keepers who aren't keen to see an ex-Dark mage succeed. Especially when Dark mages are making a play for a seat on the council, for the first time in history.
Alex finally has the law on his side -- but trapped between Light and Dark politics, investigating a seedy underworld with ties to the highest of powers, will a badge be enough to save him?