Gennady Nikiforov

When a secretary at the Danish embassy in Russia dies in suspicious circumstances, the local police seem determined to close the case. But diplomat Jack Anderson, who has been brought in to observe, falls for a beautiful singer with ties to the murder and begins his own investigation.

On the example of the history of the discovery of the "solar substance" Helium, the history of the most important discoveries in the field of physics and chemistry of the early XX century is given.