"King of Infinite Space: Donald Coxeter, the Man Who Saved Geometry" by Siobhan Roberts is a captivating biography that delves into the remarkable life and achievements of Donald Coxeter, a pioneering mathematician renowned for his groundbreaking contributions to geometry. The book unveils Coxeter's extraordinary journey, from his early fascination with the subject to his groundbreaking research and influential role in shaping modern geometric thought. Roberts expertly navigates the complexities of Coxeter's work, making it accessible to a broad audience. Through insightful anecdotes, personal reflections, and engaging narratives, she illuminates the human side of this brilliant mind, revealing the passion, dedication, and intellectual curiosity that drove Coxeter's pursuit of geometric knowledge. Readers will embark on a journey through the fascinating world of polyhedra, symmetry, and the intricate beauty of geometric forms, gaining a deeper appreciation for the elegance and power of this fundamental mathematical discipline.