Fourteen-year-old Joanna Clark, walking home from her London, England, school with her twin brother Samuel, is startled to find the family Volvo screeching to a halt beside them. The twins' mother, breathless with anger and worry, tells them that Dr. Cameron Stafford has just been released from prison in the United States, and that the family will soon be in great danger. Whisked away by their mother to the family's remote refuge in a Welsh wilderness, the twins, their beloved border collie Flurry, and their aunt Martha are pursued by ski-masked gunmen sent by Dr. Stafford to kidnap and...