Secrets of Castillo del Arco (Harlequin Presents Extra Series #229)

Reclusive billionaire Raoul del Arco's deathbed promise to a friend haunts him. He swore to marry Gabriella D'Arenberg…but knows that taking her as his wife will only destroy her innocence.

Gaby has no idea that Raoul has sworn such an oath. And when he storms back into her life, he has a dark, dangerous edge she finds disturbingly alluring.

Now, trapped in Raoul's gothic castillo, Gaby is paying the price of his promise. The key to her lavish prison? Succumbing to her new husband's touch….