Einstein dedicated his life to seeking this elusive Holy Grail, a single, revolutionary 'god equation' which would tie all the forces in the universe together, yet never found it. Some of the greatest minds in physics took up the search, from Stephen Hawking to Brian Greene. None have yet succeeded. Renowned theoretical physicist Michio Kaku takes the reader on a mind-bending ride through the twists and turns of this epic journey. This is the story of a quest: to find a Theory of Everything.