The Emerald Atlas by John Stephens

Three orphaned siblings are unexpectedly thrust into adventure when they discover a mysterious emerald-green book that can bend time; as they learn to use its pages they embark on a dangerous quest to find their missing parents, thwart a ruthless power that seeks to control the book’s magic, and come to terms with their own hidden strengths and the heavy responsibility of guarding one of three legendary, world-changing artifacts.

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