Tails had just received a signal of a strange source of power similiar to the chaos emeralds, so him and Sonic went explore it, but the blue hedgehog never came back. Tails never talked about what really happened in there, all he says is that "was his fault", Amy was very worried and even offered to go to that place, but tails didn't agree, so Shadow decided to offer since he is one of the strongest people that is friends with Sonic but Tails already had gone, but left a note behind telling his location. What will Shadow find out in that strange place?