In an Edinburgh hospital a young doctor dies in agony, trapped in a steam-filled steriliser. Three subsequent victims inexplicably bleed to death: lab technician Susan Daniels, little Timmy Watson who was recovering from his 'life-saving' operation, and an orderly who cut herself on a broken vase. All three are found to have had a powerful anticoagulant introduced into their blood. What madman is at work in the hospital? And why?Biochemist Tom Fenton...