Mary's sister Betty receives notice that she is being sued and that the Emerson Grist Mill, which has been in her late husband's family for hundreds of years, actually belongs to the Hopkinses, with whom the Emersons have feuded for generations. Betty is sure that it can't be true, but Mary isn't so certain and sets out to unravel the mill's forgotten history. As Mary digs in the Ivy Bay archives, she hears rumors of a murder that started the feud. Could it be true? And will Mary and Betty's lives ever be the same when they find out?