Dark Secrets by Linsey Hall

Some secrets change the world

The good news: I have a new life in a crazy city full of actual magic. Wild, right? The bad news: I still don’t have a guild, which means I’m halfway to being an outlaw. My days here are numbered.
When an enchanted book reveals dark secrets from Guild City’s past, a dangerous threat rises. Worse, it has stained my friend Mac with a deadly curse.

It’s up to me to save her—and maybe even the city itself—but the only person who knows about the city’s hidden past is the Devil of Darkvale, my Cursed Mate. The immortal vampire could be my downfall. But if I want any chance of saving Mac and the city I love, I must go to him for answers.