When the rebels get back to Echo Base, they discover that almost everyone is infected with Wookiee AIDS, a deadly virus that decimates Wookiee populations and slowly kills other species. Even Mon Mothma is infected. Through deductive reasoning, the party determines that Lon Startripper, during that sordid Life Day party months ago, infected Mon Mothma and Kaarla the Sullustan Sandwich Artist, who then spread the disease to everybody else (because, well, she gets around). Where Lon contracted the virus no one knows, but due to the fact that he is biologically so unlike a Wookiee, he suffers no ill effects.
Roree and Yawnee tell the party that the only way to cure Wookiee AIDS is with a special bacta formula using plants that are only found at the bottom floor of the forests of Kashyyyk, The Shadowlands, where heinous beasts lurk.
The Rebels manage to pass through an Imperial blockade by posing as researchers escorting an AIDS resistant Wookiee, who needs to be taken to a medical facility for testing. They eventually get down into the Shadowlands, led by Roree who hadn’t been there since his coming of age ritual.
Soon the Rebels are accosted by a group of marauding, swoop-riding Trandoshans who are searching for Wookiee stragglers. They try and fail to net the Wookiees, but manage to get Lon, who they mistake for a Wookiee, and a speeder bike chase ensues as Peter heads after them. In the end, the Rebels defeat the Trandoshans, save one who surrenders. And as the party contemplates what they should do with him, Roree breaks his neck making the decision much simpler.
Roree the leads the group through the forest quite deftly, avoiding any katarns and the like, until the Rebels are surrounded by a group of Wookiee insurgents. Once alliances get sorted out, they Wookiees agree to help the Rebels infiltrate the medical facility, where heinous Imperial experiments are said to take place.