June Francis 
His Runaway Maiden [EPUB ebook] 

A most tempting match… Fleeing the clutches of her cruel stepmother, Rosamund Appleby dons a youth’s disguise and heads for London…until she is halted in her tracks by Baron Alex Nilsson! Intrigued by this boy he suspects is really a well-born young lady, Alex seeks to protect her as they journey together.But when Alex, who trusts no woman, finds himself hastily and conveniently married to beautiful, courageous Rosamund, he doesn’t know which is more dangerous: the enemies plotting his downfall — or the seductive lure of a curvaceous woman in his bed…