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The book "Number Theory Through the Eyes of Sophie Germain: An Inquiry Course" by David Pengelley explores the correspondence between Sophie Germain and renowned mathematicians Joseph-Louis Lagrange, Adrien-Marie Legendre, and Carl Friedrich Gauss as they attempted to find a proof for Fermat's Last Theorem. Although Germain's plan was ultimately unsuccessful, it represented significant progress on the problem and provided insights into the theorem. The book takes an inquiry-based approach, using primary source materials to teach undergraduate students elementary number theory. It offers a unique and engaging perspective on the subject, allowing students to discover and prove results themselves. [Extracted from the article]