Many people know that Vincent van Gogh (1853-90) was a 19th-century Dutch artist, a leading light of the Post-Impressionist movement who painted Sunflowers and cut off his own ear. What, perhaps, they don't know is that he sold, in his lifetime, only one of the 2,100 artworks he painted; that his work Dr Paul Gachet sold for $152 million; that he wrote over 800 letters; and that he sent that famous ear wrapped in brown paper to a brothel. This book...