Haven - The Fae Queen's Court, #1

Most people think the fae are gone. Most people are wrong. Owen Williams wakes after a horrific car accident to find his wife is dead-and somehow turned into a gryphon-and his kids gone after a home invasion turned horribly wrong. Shattered and reeling, he vows to do whatever it takes to find them. When a fae scout appears and promises to reunite him with his kids, he doesn't hesitate before joining her.
But she warns him that if he wants to protect his family, he must follow the fae to their city, the hidden haven of Tearmann. With enemies on the horizon, Owen needs to set aside his fears and take up arms to defend their new home alongside the people he's always been taught were monsters-or he'll lose everyone he's trying to protect.