George R.R. Martin's Doorways2011

"Dr. Thomas Mason had a regular life, with a regular job, and a regular girlfriend. Until one night, zapped from somewhere else, a mysterious young woman named Cat ends up in his E R. Pursued by the government and twisted creatures from her own world, Cat inadvertently embroils Tom in her quest for freedom. Which takes him to alternative Earth's he never imagined - and which he may never get back from!"--Page [4] of cover.