A quest to close an interdimensional portal to the shadow people pushes a group of teens to the limit.

Out of the shadows, a leader will rise... It was inevitable. As more and more shadows infiltrate their world, Aaron, Wendy, Jake, and Eddie learn that what was once just silhouette and smoke has become something much more terrible, tangible, and horrifying. In Book II: Cave in the Rock, we saw the interdimensional portal torn open, releasing a flood of darkness upon the world. Now, our intrepid teens must find a way to close it again, before it's too late. Their job won't be easy either, as the Shadow People have found a way to manifest as creatures from myth and legend, wreaking havoc everywhere they go behind their new leader, Apscind. This may be the best time--or the worst--for Aaron to rise up as a full-fledged Folkteller. He'll need a lot of help from friends and strangers to stop the spreading evil and seal the portal that should never have been open in the first place. In Book III: Shadows on the Silver Strings, there's music in the air, and the sound our heroes hear may be the hopeful melody of a brand new day, or a death knell tolling--a harbinger of their impending doom.