Bound By the Guardian by Kathy Lyons

Her nephew vanished. His bear will hunt.

When Becca Weitz’s teenage ward disappears, she turns to the one man who terrifies her—Carl Carman, the brooding camp director with more secrets than answers.
Carl knows what happened. Theo shifted into a grizzly for the first time, triggering a deadly hunt. Mad scientists want the boy for their experiments, and as alpha of the Michigan bear clan, Carl will destroy anyone who threatens his people.
Protecting Theo means bringing Becca into his dangerous world. But the single mom baker is stronger than Carl expected—and the connection blazing between them could be their greatest weapon or their fatal weakness.
She’s human. He’s alpha. Their enemies want them both dead.

Originally published as The Bear Who Loved Me