The Nightshade Chronicles: Black Queen

Maxine StormCat, known by her people as the Black Queen because of the color of her blood, never planned for her life to be like this. Instead of quietly ruling the Devonii Empire, hidden deep within the Labrynth, she has spent the last ten years trying to avoid getting caught up in Overworld affairs while she hunts down the man who murdered her mother.

Qibli IronWolf is the charismatic Werewolf king of Agypten, thrown into power when his twin brother, Kato, attempted and failed to seize the crown. He's lost everyone he loved, and now he must either kill the last person in his family, or see his beloved country fall to his brother's tyranny.

When her hunt leads to her getting involved the war between the Werewolf brothers, Maxine must pick a side or lose her chance to avenge her mother's death. But in a world where nobody is what they seem, will she help a kind alpha defend his people? Or will she help a tyrant king rise to power?