If you’re relaxing somewhere like a Barnes & Noble or Waterstone's, take a quick look around; you might be surprised. This unassuming blackmail thriller suggests that bookstores aren’t the safe havens they seem to be! Diana Dors plays "Ruby," an attractive young woman who works for manager George Brent ("Harman"), but she is consistently tardy. One evening, while working late, her blouse gets caught on a drawer, and …