I think Nikola's story is trustworthy, because he gives an honest impression. He does not hesitate to talk about situations we others might find difficult to speak about.
His life is somewhat like a fairy tale, but I get the impression that he is for real. He has made lasting impressions on our world, concerning electricity. Things we now take for granted, were novelties in his time. He made major contributions concerning the distribution of electric energy, the radio, electric motors running on alternating current.
He also had great visions for humanity that all people could have their needs of energy covered, wherever on our planet, whether rich or poor. Money was not an issue for him, more a means to an end, but not an end in it's self.
There are many things to think about after reading this book!