1916: the Western Front. Private Percy Blakeney wakes up. He is lying on fresh spring grass. He can hear birdsong, and the wind in the leaves in the trees. Where has the mud, blood and blasted landscape of No Man's Land gone? 2015: Madison, Wisconsin. Cop Monica Jansson is exploring the burned-out home of a reclusive (some said mad, others dangerous) scientist when she finds a curious gadget - a box containing some wiring, a three-way switch and a ...potato. It is the prototype of an invention that will change the way Mankind views his world for ever. And that is an understatement if ever there was one... Our Earth is but one of a chain of parallel worlds, lying side by side in a higher space of possibilities, each differing from its neighbours by a little (or a lot): an infinite landscape of infinite possibilities. And the further away you travel, the stranger the worlds get. The sun and moon always shine, the basic laws of physics are the same. However, the chance events which have shaped our particular version of Earth, such as the dinosaur-killer asteroid impact, might not have happened and things may well have turned out rather differently. But only our Earth hosts mankind.