Swan Song by Elin Hilderbrand

Nantucket police chief Ed Kapenash is a few days from retirement when Bull and Leslie Richardson's home burns to the ground. Additionally, their assistant, Coco, is missing. The Richardsons have had the whole island abuzz this summer, gossiping about their lavish parties, with people clamoring to be on the guest list. However, since the Richardsons are newcomers, residents are also wondering about their pasts before they arrived on Nantucket. Told through the eyes of Coco and the many residents of Nantucket, the reader gets to see everyone's lives leading up to that fateful night. In her last novel set on Nantucket, Hilderbrand also mentions lots of the people and places (Tuckernuck!) from her other books, giving longtime readers a special treat.