Hyacinth's Secret - The Secrets of Helen's House, #5

1871 New York City glitters with gossip and promise for Hyacinth Scarborro. At last, she has Helen to herself, as it always should have been. With a plan to marry one of the cities most eligible bachelors, Irvine Westchester, and rid themselves of her dreadful cousins once and for all, Hyacinth could not be happier. Yet her plans go awry with the arrival of Oswald Flynn-Irvine's roguishly charming stable hand who encourages Hyacinth to pursue her own happiness.
As she questions her love for Irvine, Hyacinth discovers there may be more to life than power, money, and Aunt Helen's affection. Caught in a storm of forbidden love, familial ties, and societal expectations, Hyacinth must choose between the woman who gave her everything and the desires of her heart.