This is a neat introduction to the study of ontology and some of the debates in that field, particularly the so-called "problem of universals". Grossman gives a nice historical overview of some issues, albeit they are presented in a way to fit the narrative and view the book is trying to forward.
Since I'm not that well-versed in ontology and I mainly think in naturalistic terms, it was difficult to truly think the things the author tried to convey. A common naturalist will grant existence only to "individual things", while abstractions will usually be accounted for as being mental concepts. Grossman, on the other hand, is a realist about the existence of individual things, aswell as their properties, relations to other individuals, the structures they make up, the sets they are part of, the quantifiers that we use to form propositions, and facts. Although he presents many arguments against his opposing views, I simply failed to be convinced by his position. Although he presents some interesting points against nominalism, I feel like his critique of conceptualism missed the mark.