Glass by Kelsey Gamble

They call them The Lost.

I’ve spent years searching for my lost siblings before a tip leads me to Acadia National Park in Maine. Somewhere in the park’s wilderness, The Lost go to live. They’re wolves with nowhere else to go, separated from shifter civilization.
My siblings don’t belong with them.
The Lost are a makeshift pack of criminals and outcasts, and the only way to infiltrate their group and safely bring my siblings home is to become one of them.
I might have powerful allies at home, but where The Lost live, their chosen Alpha has all the power. And when Felix Slaughter announces our mate bond to their pack, I realize my siblings might not be the only members of the Glass family who will never be found again.
When poachers threaten the very existence of the pack, I have to decide once and for all what I’m willing to give up to save The Lost I love.