If this, Uwe Timm's enchanting novel, were a cautionary tale, the tag line would go something like this: Should you plan to be in Berlin on Midsummer Night, the time of the summer solstice - Watch Out The narrator of Timm's story is a writer who simply can't get started on his next book. So he accepts a commission to write an article about potatoes. He has some interest in the subject because of an uncle who could, remarkably, from taste alone, differentiate...