The Last Solstice - A Wolf Shifter Romance #994879

The final Solstice will either free every pack, or bind them forever.
Seren Vale has spent her life hiding a power that lets her see the difference between a chosen bond and a chain. When she severs a command buried inside a frightened child, the act awakens an ancient road and summons Tavian Rook, the last Solstice Warden.
Tavian was raised to believe obedience keeps the packs alive. His seal says otherwise. It can seize his body, silence his wolf, and force him to deliver Seren to the final altar.
With seventeen days until moonrise, Seren and Tavian uncover erased names, imprisoned Wardens, and a counter-oath hidden by the mothers who refused to let their children become weapons. The closer they come to the truth, the more dangerous their growing connection becomes. Seren will not trade one form of captivity for another, and Tavian cannot ask for her trust while he still carries the command that could betray her.
When the Solstice begins pulling every pack bond toward a single authority, they must decide what deserves to survive: the magic that binds their world, or the freedom to choose one another.
The fourth and final book in The Solstice Wolves Series. Best read in order.