When pretty young widow Mary Christopher races from her vacation house upstate to catch the train for N.Y.C. and a business appointment, her children, Tom and Linda, are playing on the enclosed porch; her mother-in-law Alice is foraging in the garage for papers that Boy Burgoyne, an unlikable relative, needs; and Boy's chauffeur, Polish war hero Lesske, is just heading down the drive. By the time Mary arrives in New York, the children are missing, and by the next morning Alice is hospitalized with a heart attack. Shortly thereafter, the children's bodies are discovered, Alice and the family refuse to talk to Mary, and the police think she killed her own children. Did she? A neighbor's nephew, Danny Valenti of the Fraud Squad, noses around, and soon Mary and Danny are speeding along the parkway to retrace Mary's path, identify the driver/owner of a car that dogged her, and crack a cover story or two, including one begun in the days just after WW II involving a major and a Nazi who was most helpful to him. Nonexistent suspense, but plenty of far-fetched plotting from labored-thriller writer Winslow (Judgment Day, The Windsor Plot).