The book provides an overview of how to think like Sherlock Holmes. It analyzes different aspects of his mental process, highlighting his exceptional powers of observation, deduction, and imagination. The text explores how these cognitive skills can be developed and cultivated through various techniques, such as mindfulness, mental distancing, and a focus on objective reasoning. It also examines the limitations of our brains and the importance of recognizing and challenging our biases. The text argues that, with dedication and practice, we can all develop a sharper and more analytical way of thinking.