Most days, it's well past noon when the lovely Astrid Donal lifts her sleepy blond head to face the day. Perhaps she fell asleep star-gazing, nestled against a mink coat on the pristine lawn of the Marsh estate. Or she may find herself wrapped in buttery silk sheets on the sumptuous bed in her suite. Wherever Astrid wakes, she greets the morning with memories of the night—dancing 'til dawn at decadent parties, sipping champagne with other frivolously fun girls.

She's left Miss Porter's boarding school for young ladies in Connecticut, for the north shore of Long Island. Here she resides in the mansion of her mother's current husband—a man of inexhaustible wealth, whom Virginia Donal de Gruyter Marsh married exclusively for his money. Astrid's irksome mother fancies herself every bit the beguiling young flapper that Astrid is. But all that matters to Astrid is Charlie Grey.

Charlie and Astrid's tumultuous romance is legendary among their social set . . . but this summer all the buzz is about a brand new Grey—Charlie's long lost sister, Cordelia. Could she be a bright new ally for Astrid?