Heat of a Savage Moon (The Moon Trilogy #2)
Jane Bonander

Proud and angry, he had no use for the delicate Widow Weber. And her horror of "savages" drove him to fury - for cultivated, educated Jason was part Karok Indian. Yet russet-haired Rachel, with her lush body and sensuous innocence, tempted him as no woman ever had.
He was fighting to protect the heritage of his people. She was determined to solve the mystery of her husband's murder. They were destined to be enemies, but son they would be swept up in a whirlwind of danger and desire - unable to resist the ecstasy of forbidden love, and unable to deny the fiery heat of a bold and breathtaking passion.