Necroscope #1

A Necroscope is a person with an ESP power that allows him to speak with the dead. Communication is two-way and peaceful. Harry Keough is the greatest Necroscope in the world. Harry Keough is the master of the Mobius Continuum—another dimension existing parallel to all space and time. It serves as his personal instantaneous gateway to anywhere in the known universe, past or present. It's a major shock to Harry when he observes for an instant an unknown human hurtling uncontrolled through the endless coils of the Mobius Continuum. Who was this stranger and how did he find himself in the mind-numbing dimension? More to the point, if he was not someone who entered the dimension on his own, who sent him there? Was this an attempt at murder by Mobius?