The Infernal Nexus — Dave Stone

Acting on an abstruse tip-off from the reknowned paraphysiologist Dr Rupert Gilhooly, Bernice Summerfield has found herself on a probe-ship heading deep into the Problematic Heart of the galaxy -- not knowing what, or quite who, she might find. What she finds is Station Control. A place that exists, simultaniously, in 417 dimensions, a brawling, souk-like Nexus between every world that can, or has, or ever will be. And one of those dimensions is Hell. Bernice knows nothing of the rivalries and power-plays going on here. So she blunders right into them and makes a complete hash of everything, natch.