When the Pitts plan a Christmas vacation to Paris sans hers truly, she cantankerously retreats to the chilly, windswept, provincial Romney Marshes of her daughter's parents, Caroline and Joshua Fielding. Joshua's cousin Maude Barrington is well-traveled and friendly, but her strangeness and impropriety send Grandmama over the edge. When Maude fails to wake, Grandmama senses foul play. She uncovers truths about Maude and herself.