"Simplicial Complexes: Face Numbers and Beyond" is a non-fiction book that explores the fascinating world of simplicial complexes. It provides an in-depth analysis of the structure and properties of these mathematical objects, which find applications in various scientific disciplines. The author, Sheena, guides readers through fundamental concepts such as face counting, which serves as a starting point for understanding the structure of a simplicial complex. Additionally, the concept of simplex homology is introduced, allowing for the revelation of hidden properties of these shapes. The book goes beyond basic aspects and highlights the broad applications of simplicial complexes in modeling complex systems, topological analysis, and various fields such as computer graphics and 3D printing. It also addresses the importance of visualizations and interactive tools to better grasp the concepts, as well as the historical context that describes the development of simplicial complexes in mathematics.