I have the book (via a gift) and although at times, I liked the author's quirky writing style, there is not much in it to teach you how to "save your life" leaving the book's title to be very misleading to say the least.
How a somewhat mediocre and misleading titled book is going to translate into a successful movie remains to be seen.
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Earth and sky, woods and fields, lakes and rivers, the mountain and the sea, are excellent schoolmasters, and teach some of us more than we can ever learn from books.
John Lubbock