The Perfect Couple Book By Elin Hilderbrand 

It's Nantucket wedding season, also known as summer-the sight of a bride racing down Main Street is as common as the sun setting at Madaket Beach. The Otis-Winbury wedding promises to be an event to remember: the groom's wealthy parents have spared no expense to host a lavish ceremony at their oceanfront estate.
But it's going to be memorable for all the wrong reasons after tragedy strikes: a body is discovered in Nantucket Harbor just hours before the ceremony-and everyone in the wedding party is suddenly a suspect. As Chief of Police Ed Kapenash interviews the bride, the groom, the groom's famous mystery-novelist mother, and even a member of his own family, he discovers that every wedding is a minefield-and no couple is perfect. Featuring beloved characters from The Castaways, Beautiful Day, and A Summer Affair, The Perfect Couple proves once again that Elin Hilderbrand is the queen of the summer beach read