This book investigates the core epistemological question of what constitutes knowledge as presented in Plato's dialogue, Theaetetus. David Bostock, a noted scholar of ancient philosophy, provides a rigorous, line-by-line analysis of the text to evaluate the validity of the arguments regarding perception, judgment, and the definition of knowledge. By situating the dialogue within the broader context of Platonic thought, the author constructs a framework that clarifies the logical progression of the debate between Socrates and his interlocutors.

Experts frequently cite this work as a highly accessible entry point for students because it does not require knowledge of Ancient Greek. Scholars note that the text provides a balanced, thorough critique that remains a standard reference for those studying Platonic epistemology.