When the world is turned upside down, who can you trust?
Cambridge, England - a professor with links to Iran's nuclear programme is found dead on a park bench, a victim of poisoning by persons unknown.
At the same time, in New York, USA, a leading cardiologist is killed in an apparent hit-and-run.
And in Hamburg, Germany, a successful academic publisher is shot dead on a backstreet.
What links the deaths is that the victims were all prominent...