This book investigates the ontological status of propositions by arguing that they are indispensable entities whose traditional definitions are fundamentally inadequate. The authors, Jeffrey C. King, Scott Soames, and Jeff Speaks, are prominent philosophers specializing in language and mind. They utilize contemporary linguistic theory and cognitive science to critique historical accounts of propositions before presenting their own distinct, modern frameworks for understanding these entities.

Experts recognize this work as a significant contribution to contemporary analytic philosophy, noting its high level of technical rigor. Readers frequently highlight the density of the prose, which is intended for advanced students and professional philosophers in the field.