Following their last battle, Dr. Eggman's been mysteriously absent from Sonic's life. What shocking secret will Sonic discover when he learns the bad doctor's whereabouts? Plus, Sonic isn't the only one looking for Eggmanso's his old frenemy Shadow the Hedgehog! There are twists and turns in the course of this highspeed, actionpacked mysteryadventure! But with a little help from his friendsincluding a new allySonic's fast enough to overcome any obstacle! Collects issues #58 of the ongoing series.