When Silver is suddenly liberated from the only home he’s ever known, a prison that siphons magical power from its inmates, he quickly learns how powerful he is and how dangerous that power can become. Opal Amberfire, Owen Peacemyst, Nova Starlight, and Fluffy soon join him on a mission to defeat the world's greatest evil, The Shadow. But this is just the beginning. Follow these agents through their journey on Nautilus through every trial they face from the first prologue to the very last epilogue.