Who is Modern Physicists from Zero: The Biography of a Dangerous Idea and what is their importance?

In some ways, zero is not the protagonist of Zero: The Biography of a Dangerous Idea but instead is the antagonist. Zero creates problems and holds answers for important groups of people: philosophers, mathematicians, theologians and physicists. But it is perhaps these groups that are best described as protagonists. They often pursue zero, often ignore it, and are nearly always frightened by it.