Laurie Benson 
His Three-Day Duchess [EPUB ebook] 

He’s claimed his title Can he inherit a bride too?Part of The Sommersby Brides. The Duchess of Skeffington has retreated to the estate that was her refuge during her cruel marriage. She’s shocked to come face to face with a distant heir, now the new Duke, adventurous Simon Alexander. When Elizabeth is robbed it’s up to them both to find the thief. But travelling together will attract too much gossip… Unless they pose as husband and wife…!