Cecelia Ahern. The Book of Tomorrow

Born into the lap of luxury and comfortable in the here and now, spoiled, tempestuous Tamara Goodwin has never had to look to the future—until the abrupt death of her father leaves her and her mother a mountain of debt and forces them to move in with Tamara's peculiar aunt and uncle in a tiny countryside village. 
Tamara is lonely and bored, with a traveling library as her only diversion. There she finds a large leather-bound book with a gold clasp and padlock, but no author name or title. Intrigued, she pries open the lock, and what she finds inside takes her breath away.

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