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Not one of his best. I’d recommend it to readers who already know they like Simak or those looking for mainstream SF from the Seventies. Familiar are the magical friend, faithful dog, and plucky girlfriend, besides the familiar backdrop of aliens coming to a small town in Wisconsin (as in All Flesh is Grass and his well-known short story The Big Front Yard). Simak assumes that the finders of a time travel device would use it to make money and he has tart fun with shysters, hucksters, and PR liars.