Fool's Paradise — Renate Chapman

Quite suddenly Violet Maybury found herself at a magnificent mansion on Paradise Point, secretly engaged to handsome, aristocratic Brandon Purcell and working as secretary-companion to his great-aunt. Before marrying Violet, whose family was anything but rich, Brandon wanted her to win the approval of wealthy Aunt Sophie, who controlled the Purcell fortune.

From the start, though, unfriendliness and suspicion were directed at Violet by members of the old woman's household. And soon, the newcomer learned about the other girl in Brandon's life. Then, Aaron St. John, the enigmatic young scientist staying at the Purcell guesthouse, took an interest in Violet that was almost sinister. But the worst surprise of all was yet to come...