When newlywed Lord and Lady Essendon invite their respective families and friends to spend the summer at their country estate, no one suspects that the groom’s brother, Mr. Grayson Hawthorne, and the bride’s brother, Lord Charles Aspenden, Viscount Broxbourne, have a history together…and that history isn’t good. The two former lovers are at each other’s throat almost from the moment the party begins. But when the bride and groom have a falling out that could end both families’ chances for lasting happiness, it’s up to Grayson and Charlie to either patch things up between the bride and groom or split them up and go their own separate ways for good. Which will it be?