Maze of Worlds

Earth is under attack! Alien beings bent on our destruction have seeded the world with horrible machines capable of transforming our planet into a hellhole where only they can live. Our only hope is a small group of intrepid adventurers who just might be able to unravel the mystery of the alien machinery and turn it against these deadly enemies. The House of Doors taps the minds of its captives and creates worlds based on their worst nightmares.
Jack Turnbull, once a secret service "minder," now a recovering alcoholic, finds in the House of Doors alcoholic temptation beyond imagination. Angela Denholm discovers that she hasn't quite forgotten her brutal ex-husband, Rod, after all. For Spencer Gill, whose native understanding of machinery borders on the supernatural, the House of Doors is doubly dangerous. Not only is its alien technology almost too perverse for him to even begin to understand, it creates for Gill a world of useless machines that threaten his sanity.
If Spencer Gill and his comrades cannot uncover the traitor in their midst, solve the maze of the House of Doors, take over its master computer, and use the aliens' own technology against them, our planet is doomed.