What is the author's style in Nicholas and Alexandra by Robert K. Massie?

Massie is well qualified to write the book since he is a writer who majored in history at Yale and Oxford. His attention to detail and knowledge of the events has to impress the reader as well as his insight in living with the disease and what it means for the parents. Alexandra and Nicholas come across as human and real in terms of being parents to a sick child. This is because of the author's ability to inject insight and understanding into a mother and father dealing with their suffering child. The reader has to be impressed by the method of presentation of the material.