When Harry Barnett is informed that his son is in hospital in a diabetic coma, he is certain that there must be some mistake, since he does not have a son. But he soon discovers that he does. David Venning was a brilliant mathematician, and his tragic condition is taken to be the result of an accident or a suicide attempt. But his notebooks are missing, and two other fellow employees have died in suspicious circumstances. Coincidence? Or is David the victim of attempted murder? Download and start listening now!