A Glimmer In the Dark (Electronic book text)

In a world many light years away, Vannood, a glimmerman who uses the source to conjure death and compel the innocent to his will, plots against his king. But justice is closing in and he is desperate to escape retribution. He finds a way to communicate with Michael Donovan on Earth; an ex PIRA renegade and killer. Donovan and Vannood are doppelgangers identical in evil. The plan is to exchange worlds; modern weapons to horrify a mediaeval society and mastery of the glimmer to terrify the Earth. John Blacker, middle aged innocent, stumbles into the middle of an unholy exchange in the first volume of The Glimmer trilogy