From the back cover:
"That place... is strong with the Dark Side of the Force. A domain of evil it is ..."
"What's in there?"
"Only what you take with you."
Stranded on the swamp world of Trinta and pursued by relentless bounty hunters a group of Rebels face horrors drawn from their own minds — horrors with the power to destroy them! Pitted against the powers of an insane Jedi Knight and the Dark Nexus in which he dwells, the Rebels must triumph or risk falling to the Dark Side of the Force.
64-page book features:
Survey report and maps of Trinta, a swamp planet far from the Galactic Core.
Newly-revealed information on the Dark Side of the Force.
Descriptions of a nexus of evil like the one Luke Skywalker faced on Dagobah
Tests of bravery and honor based on the Jedi Code.
Adventure script and cut-aways to help capture the mood and feel of the Star Wars movies.