To Tame a Wolf (Historical Werewolf #5) by Susan Krinard

HE COULD NOT ESCAPE THE BESAT WITHIN

Her innocence destroyed, young widow Tally Bernard swore that she would never trust a man again. But when her brother disappears, she has little choice but to make a pact with the devil.

Though he wants nothing more than to live a quiet life on a ranch of his own, Simeon Kavanaugh can't escape the legacy of his werewolf father. The animal instincts that keep him from being fully human also make him a brilliant tracker, forced to survive on the desperation of people in need.

The attraction between these two wounded souls is immediate, primal -- and dangerous. If Simeon has any hope of saving Tally, he must do what he has always resisted and merge both man and beast within him. But if she cannot accept what he becomes, his choice may cost Simeon the only thing worth having - Tally's love.