Nick and her cousin, Helena, have grown up sharing sultry summers at Tiger House, the glorious old family estate on Martha's Vineyard. When World War II ends, Helena is leaving for Hollywood and a new marriage, while Nick is to be reunited with her young husband Hughes, due to return from London. Neither finds quite the life she imagined, and as the years pass, the trips to Tiger House take on a new complexity. When Nick's daughter Daisy and Helena's son Ed make a sinister discovery at Tiger House, it sends a depth-charge to the heart of the family.