The Prince's Convenient Proposal (Harlequin Romance)

The stand-in fiancée 

To secure his country's future, reformed playboy Prince Rafael of Montaigne needs a wife. A convenient marriage seems the ideal solution…until his fiancée disappears and Rafe must ask her identical twin sister, Charlie Morisset, to become his stand-in bride-to-be! 

Down-to-earth Charlie accepts Rafe's convenient proposal—in exchange for the funds to save her baby sister's life. Being swept into a crazy royal whirlwind seems a small price to pay, until she finds herself falling for Rafe—a prince she knows she will have to walk away from…