The Wind in the Willows needs no introduction - children have enjoyed the exploits of its characters for generations. Few would guess that its author, Kenneth Grahame, was a tortured soul. Marriage to the predatory Elspeth Thomson, when both seemed destined for the single life, was a shared fantasy of invented truth. Out of that union came a catastrophically spoiled son, 'mouse', for whom that greatest of children's stories was written. It was the...