Author Robert Treskillard continues his Merlin Spiral series with book two, Merlin's Shadow, another fresh take on the ancient Arthurian myths. After destroying the sinister Druid Stone and freeing his people from its dark control, Merlin finds himself a royal advisor without a king. Along with his friend Garth, and Natalenya, his betrothed, Merlin treks north with the orphaned Arthur in hopes of keeping the young king safe from soldiers misled by their turncoat captain. As the threat on all their lives increases, Merlin discovers their only hope is sailing to the lands of eternal darkness, and once again cleansing the world from an ancient and powerful evil.