The article reviews *The Geographic Mosaic of Coevolution* by John N. Thompson, published by the University of Chicago Press in 2005. The book explores the theory that coevolutionary processes are best understood through a geographic lens, rather than studying single populations. Thompson's theory, known as the Geographic Mosaic of Coevolution (GMTC), posits that natural selection varies among populations due to differences in how species fitness depends on each other, reciprocal selection occurs within local communities, and trait-remixing leads to few species-level coevolved traits. The review highlights the book's strengths, such as its comprehensive coverage of coevolutionary interactions and its ability to bridge gaps in current understanding. However, it also notes areas where Thompson's hypotheses lack sufficient data, particularly in the context of predator-prey interactions. Overall, the book is praised for its interdisciplinary approach and its potential to advance the field of coevolutionary biology.The article reviews *The Geographic Mosaic of Coevolution* by John N. Thompson, published by the University of Chicago Press in 2005. The book explores the theory that coevolutionary processes are best understood through a geographic lens, rather than studying single populations. Thompson's theory, known as the Geographic Mosaic of Coevolution (GMTC), posits that natural selection varies among populations due to differences in how species fitness depends on each other, reciprocal selection occurs within local communities, and trait-remixing leads to few species-level coevolved traits. The review highlights the book's strengths, such as its comprehensive coverage of coevolutionary interactions and its ability to bridge gaps in current understanding. However, it also notes areas where Thompson's hypotheses lack sufficient data, particularly in the context of predator-prey interactions. Overall, the book is praised for its interdisciplinary approach and its potential to advance the field of coevolutionary biology.