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This book is by author Nicholas Sparks and his brother, Michael "Micah" Sparks. Tragically, they lost their parents in a horse-riding accident, and then they lost their only sister, Danielle "Dana" Sparks to cancer. The two brothers then spent three weeks traveling the world together, and it seemed to make their relationship stronger – which is good, because now they were all each other had. Although I haven't read this yet, I ultimately plan to.