The Master of Trelorne House. Moonstone Romances, #3

Helen Sullivan had no illusions left. With her father gone, her savings dwindling, and respectable employment proving harder to find than pride would allow her to admit, the advertisement for a temporary companion post in Cornwall seemed less like opportunity than necessity. Trelorne House, perched above a restless sea, offers accommodation, wages, and the quiet work of reading letters to Agnes Graveson, an elderly woman with a sharp tongue and a sharper mind.
But the true master of Trelorne is not Agnes. It is her nephew, James Graveson: cold, controlled, and convinced Helen has come to insinuate herself into his aunt's affections for the sake of the family fortune. Helen is too proud to explain how desperate her circumstances have become. James is too suspicious to believe in her innocence. And as storm and scandal close around the house, the hostility between them begins to shift into something far more dangerous.
Because James Graveson may distrust Helen Sullivan, but he cannot keep away from her. And Helen, who came to Trelorne with nothing but her pride, may find that surrendering her heart is the one risk she cannot afford to take.