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This book is not a how-to on becoming a human lie detector but rather a dark psychology primer on reading the people in your surroundings to read your environment and better know your place in it. It is ineffectual for short term quick reads as it focuses much more on the long term relationships and rapport.
I live in a world where I meet a lot of new people and I have to figure out if I can trust them very quickly. Apply the principles in this book has allowed me to speed up the process and avoid a lot of heartache