The Duke and The Baron : a Romance Novel With Pictures. Lords of Time : Illustrated, #2

Amelia is one grand misstep from being sent to Bedlam. The only thing protecting her odd behavior is the status of her ill father, but he won't be around forever. Amelia must marry. It seems simple as Amelia was contracted to marry the Duke of Castleberry when they were children, except her friend Hugh is trying to get between them and take her for himself. But the duke has come to claim his wife.
Hugh doesn't think Charles can be trusted with his beloved friend, but Charles is determined to make a wife of her no matter what Hugh thinks. None of them will find happiness, however, until they all three learn to embrace the absolute surrender.