Shadowborne: Fang

Secrets can save a kingdom—or destroy everything.

Bren is the first female to attain the coveted rank of Furyknight—the legendary society of men chosen and bonded by dragons, and trained for war. Desperate to hide that her Commanding Officer is also her mate, Bren throws herself into her new duties, only to discover that the Furyknights also hide secrets under their wings.
Donavyn introduces Bren to the Shadowfang. Unknown even to other Furyknights, the covert society’s training in stealth and espionage are Bren’s refining fire. But, as her skill grows, so does Donavyn’s fear. To him, Bren is precious. To the King she’s becoming a dangerously expendable weapon.
Donavyn ensures she’s trained mercilessly, while secretly craving vengeance on the men who hurt her before she was his, and hiding that darkness even from his dragon. But secrets need sunlight to heal.

As Bren fights to prove her worth as a spy, her past emerges to ignite a white-hot fire.
Those flames threaten to burn Donavyn—and every honorable intention he ever held—to ash.