This groundbreaking study delves into the concept of modality de re, positing that objects possess both inherent and circumstantial properties, an idea that has sparked intense debate among philosophers such as Saul Kripke, David Lewis, and Ruth Marcus. Through the lens of possible worlds, Plantinga constructs a rigorous defense of this notion, tackling pivotal issues like essence, transworld identity, negative existential statements, and the existence of unrealized entities in alternate realities. Furthermore, he leverages his logical frameworks to shed light on two enduring conundrums in the philosophy of religion: the paradox of evil and the ontological argument.