Beyond of faith -and without prejudice to it- this book reveals clear signs on the existence of God, in a way as a detective finds evidences regarding the fact that investigates. It Investigates the existence in itself of God, without relying on interpretations of the sacred books, although sometimes refers to any of them. Is not based on dogmas of religious organizations, these human constructions that often do not resist the rise of science and consciousness, but that while last, filled with dogmatic mountings the minds of a lot of people. It is based, rather, in the honest and responsable reflection; in the observation of nature; in life herself.