Silvercloak by L. K. Steven

In this addictive new fantasy series set in a world where magic is fueled by pleasure and pain, an obsessive detective infiltrates a brutal gang of dark mages—knowing that one wrong move will get her killed. . . .

“A dazzling (and frequently sizzling) new fantasy.” —Kiersten White, #1 New York Times bestselling author of Lucy Undying

Two decades ago, the Bloodmoons ruthlessly murdered Saffron Killoran’s parents, destroying her idyllic childhood. Hell-bent on revenge, she lies her way into Silvercloak Academy—the training ground for her city’s elite order of detectives—with a single goal: to bring the Bloodmoons to justice.
But when Saff’s deception is exposed, rather than being cast out, she’s given a rare opportunity: to go undercover and tear the Bloodmoons down from the inside.
Descending into a world where pleasure and pain are the most powerful currencies, Saff must commit some truly heinous deeds to keep her cover—and her life. Not only are there rival gangs and sinister smuggling rings to contend with, but there’s also her growing feelings for the kingpin’s tortured son, with his vicious pet fallowwolf, his dark past, and the curious prophecy foretelling his death at Saffron’s hand.

With each day testing her loyalties further, Saff finds her web of lies becoming harder to spin. And when one false step could destroy everything and everyone she’s ever loved . . . the detective who’s dedicated her life to vengeance just might die for it.