From the introduction:
Beyond the sane normality of realspace, in a dimension one step removed from the shifting colors of hyperspace, Rebel heroes face a deadly threat from another galaxy.
Here abandoned ships from all over known space float beside those of unknown origin. These desolate craft orbit a giant vessel, drawn to it like a moth to a flame - or a spider's web.
Within the dark interior of a giant ship, the war between rebel and Imperial finds new battlegrounds and new weapons with which to destroy each other. But they also find something else, something that just may find them first. It wants to escape otherspace, to reach realspace. And when it does, the galaxy will die!
Also included in this module is a Star Wars Miniatures Game Scenario.