A river of golden bones / A. K. Mulford.

Enhanced descriptions from Syndetics:

From bestselling author of the romantasy sensation The High Mountain Court comes A River of Golden Bones, the first riveting, enchanting novel in an all-new romantic fantasy shifter trilogy, which begins a journey of self-discovery, romance, and adventure for a young heir as she/they comes out of hiding to save their sister from a malicious, powerful sorceress and her dangerous sleeping curse.

A sleeping curse. A fallen court. A secret twin.

Twins Calla and Briar have spent their entire lives hiding from the powerful sorceress who destroyed their kingdom...and from the humans who don't know they are Wolves. Each twin has their own purpose in life: Briar's is to marry the prince of an ally pack and save the Golden Court. Calla's purpose is to remain a secret, her twin's shadow . . . the backup plan.

No one knows who Calla truly is except for her childhood friend--and sister's betrothed--the distractingly handsome Prince Grae. But when Calla and Briar journey out of hiding for Briar's wedding, all of their well-made plans go awry. The evil sorceress is back with another sleeping curse for the last heir to the Golden Court.

Calla must step out of the shadows to save their sister, their kingdom, and their own legacy. Continuing to hide as a human and denying who she truly is, Calla embarks on a quest across the realm, discovering a whole world she never knew existed. Outside the confines of rigid Wolf society, Calla begins to wonder: who could she be if she dared to try?

Full of adventure, love, gender exploration, and self-discovery, A River of Golden Bones follows Calla's journey through treacherous Wolf kingdoms, monster-filled realms, and the depths of their own heart in this thrilling romantic fantasy.