The Missing Heir — Wren St. Claire

Julia Hertford has spent most of her life disguised as a boy, following her rogue father all over the continent. When Julian Hertford senior vanishes from their Paris gambling house, Julia and her faithful servant Tom pack up their belongings and flee to England, following a possible clue to her father's whereabouts. Julia seeks help from the only family member whose name she knows, the Earl of Kylsant.
Richard Rothwell, Earl of Kylsant, is about to have his world turned upside down by a cousin he never knew he had. The trouble, brave and beautiful Julia brings in her wake, is nothing to the passionate desire she stirs in his heart.
But before he can claim her as his own, he must help her find her errant father.
.