City of the Enchanted Queen by Olivia Ash

Once a guardian of the people, Sophia is now a wrongfully convicted fugitive of Nighthelm—and the hunt is on.
Deadly assassins stalk her every step, and the murderous creatures of the Witch Woods are hot on her heels. Nothing and nowhere is safe. Anyone brave enough to fight beside her risks a gruesome death.
Her only redemption is to restore the rightful heir to the throne—but the clock is ticking.
Though Sophia and her men barely escaped Ripthorn mountain with their lives, they must return. For deep in the mountain, the heir still lives… for now.
Enchantments, corruption, and assassins stand in Sophia’s way.
As with so many things in this timeless city, not everything is as it seems. Old enemies resurface. Painful truths are unearthed. And the only way for Sophia to discover the truth behind her fractured magic is to end the Nameless Master’s takeover… no matter the cost.
Edric is a master of war. Zeke, a master of magic. Andreas, a master of death. These men fear nothing but losing the woman they love—and though they would die for her, only Sophia can end the bloodshed.
For the truth is she’s painfully familiar with the one responsible for the deep corruption in Nighthelm…
And she’s closer to the lethal truth than even she realizes.