Spellbound

Spellbound is the second book in Larry Correia's Grimnoir series, set in the 1930s era with the addition of superpowered Actives. You need to read Hard Magic first to understand Spellbound. This is nothing to complain about-- see my review or just note that Hard Magic has, in Larry's words:

a teleporting magic ninja fight on top of a flaming pirate dirigible in a world with bear cavalry, gangsters, wizards, and John Browning fighting the magic samurai of Imperial Japan with Tesla super weapons"

so you should want to read it. And if you don't, what's wrong with you?

The Grimnoir are a society of Actives who are trying to protect normals from abusive Actives, and Actives from hostile normals. Jake Sullivan is former solider, former private eye, who looks like a big dumb bruiser. He is now a Knight of the Grimnoir, and an Active Heavy (more formally, a Gravity Spiker). When someone attempts to frame the Grimnoir for an assassination attempt on the President, and when Jake gets a phone call from an enemy he already killed ... well, things get interesting.

Larry's other series is Monster Hunter, and one thing that bugs me about that series is that the protagonist has been granted a one-of-a-kind divine mandate by authorial fiat. (This happens in other successful series, but it bugs me there too). The Grimnoir series doesn't have that problem; Heavy Jake does have super powers, but so do about 1% of the rest of the population. He's better at using them, but only because he's smart and self disciplined.

Buy it in hardback. Read it on nights when you don't have to go to work the next morning.