The Cat Who Walks Through Walls

This book written by R. Heinlein in 1985 is about paradoxes, multiple time universes, and self-aware computers. The book is fast paced, action packed story of Colonel Colin Campbell and his partner, a beautiful and sophisticated lady, Gwen Novak. The story is situated sometime in the future when humans live in space colonies and they have already colonized the Moon. Our two characters are descendents of the Methuselah's Children (also name of another Heinlein’s book), a new generation of long-lived breed of humans with their life span between several hundred to several thousands years. Ok, it will get even more complicated. Heinlein is representing his idea of so called Pantheistic solipsism, the theory that universes are created by the act of imagining them. For example the Land of Oz is somewhere real. They are not only real but also they can coexist simultaneously on different time lines. Our two characters take part in Time Corps, the organization that travels between those parallel universes, manipulates the time and thus adjusts the events to keep all these universes in peace. We should not forget the self-aware computers. The computers of the future can self-program, self-upgrade, and self-improve themselves. We should not be surprised that some of them after several thousand years of this self-development process reach self-consciousness similar to the human one. These self-aware computers are important key for time-travel between the parallel universes. In this book there are a lot of characters and ideas used in other Heinlein’s works and the author seemed to pack them nicely all together. The cat in the book refers to famous Schrödinger's cat from quantum mechanics.