Reckless

For years, Jacob Reckless has been secretly disappearing to another world, a world behind a mirror, a world for which his father abandoned his family. The mirror world is Jacob's escape from reality. It's a place for treasure hunts and magnificent quests. A world where witches haunt the forests and giants and dwarfs roam. A world locked in a deadly war.
Jacob's secret seems safe, until one day his younger brother Will follows him, with disastrous consequence. Faced with a curse that is quickly turning Will to stone, the Reckless brothers are thrust into a race against time to find a cure before Will is lost forever.