The thirteen chapters of Mark and Theo Make Their Case aim to impart three central philosophical skills: identifying a problem, making an argument, and making objections. The book falls into two parts. The first part, Chapters One through Seven, is inspired by Plato’s quest for a perfect world; the second part, Chapters Eight through Thirteen, is inspired by Aristotle’s rejection of that world.

The Mark and Theo Make Their Case teacher manual, for parents and teachers both, is the instructor’s guide to implementing the student book. It provides a summary of the plot developments for each chapter, a philosophical basis for the key concepts in the chapters, discussion questions based on Bloom’s Taxonomy, and suggestions for activities.