Summertime getaways to Nantucket top the list of celebrity and sunseeker alike, and this summer is no exception. Bookshop owner Meagan Poe welcomes the island's many visitors with the Summer of Mystery author reading series. But just as it's about to kick off, a mystery of another sort strikes. Two vacationers are the talk of the town. Known for traveling around on a tandem bicycle, they mostly keep to themselves. Yet Meagan soon befriends the pair...

Blue Hill is celebrating is first-ever Railroad Days Festival, and the main event is an antiques appraisal and auction. Contributions come from many of the townspeople, but the most valuable item - an ancient Chinese vase worth ten thousand dollars - has been donated anonymously. The benefactor has asked that the proceeds from the vase go to the Blue Hill Library, but Anne barely has time to wonder who could be so generous before the vase is stolen...