Rife with hostile cultures and outright enemies, the Unknown Regions hold many perils for Luke Skywalker and the Jedi, who are searching for Zonama Sekot - the living planet that may hold the key to dealing once and for all with the Yuuzhan Vong.

The troubles for the embattled living planet Zonama Sekot have just begun. As Luke Skywalker and Jacen Solo negotiate its place in the galactic struggle against the Yuuzhan Vong, one of its organic ships is taken by the alien invaders. Scientist Nen Yim is ordered to use the captive to find weak spots in Zonama Sekot's technology. But what Nen Yim discovers about the planet and its mysteries shocks her to the core.

From the ashes of the New Republic, torn to shreds by the savage Yuuzhan Vong forces, the newly formed Galactic Alliance has risen, determined to bring peace to the entire galaxy. But first the Yuuzhan Vong must be contained once and for all. And so Luke Skywalker seeks a world long lost to legend: Zonama Sekot, a sentient planet believed to have repelled an invasion by the Yuuzhan Vong decades ago. Deciphering the enigmatic secrets of Zonama Sekot just might turn the tides of a relentless war.

The Galactic Alliance's hard-won success in countering the Yuuzhan Vong onslaught has proven all too brief, and the tide has turned once more to the invaders' advantage. Having overcome the sabotage strategies of the Jedi and their allies, the marauding aliens have pushed deeper into the galaxy and subjugated more worlds in their ruthless quest for domination.

In the war against the ruthless Yuuzhan Vong, the fall of Coruscant leaves the New Republic divided by internal strife, and on the verge of bowing to conquest. But those who steadfastly refuse to consider surrender - Luke Skywalker, Han Solo, Leia Organa Solo, and their children and comrades-in-arms - are determined to seize victory against overwhelming odds.

Luke Skywalker's daring mission to halt the Yuuzhan Vong's nefarious plot to overthrow the New Republic is struggling on all fronts. And time is slipping away for Han and Leia Organa Solo, trapped on a small planet whose rulers are about to yield to Yuuzhan Vong pressure to give up the Jedi rebels.

Scattering after the Yuuzhan Vong's invasion of Coruscant, the panic-stricken members of the New Republic Advisory Council pause just long enough to set up a mock defense on nearby Borleias and attempt to buy time - which fools no one, least of all the Jedi. Bearing down swiftly on Borleias is a Yuuzhan Vong invasion fleet, determined to destroy the galaxy's remaining defenders.

With the enemy in hot pursuit, Jaina Solo is forced to seek haven in the unfriendly Hapes Cluster, where the Jedi are held responsible for a past tragedy - and where the royal family has grim plans for their famous Jedi guest. Even more sinister are the intentions of the Yuuvhan Vong, desperate to capture Jaina for a hideous sacrifice. Grief-stricken and obsessed with revenge, Jaina is blind to these threats and to the overpowering evil dangerously close to consuming her.

The brutal Yuuzhan Vong are scouring the universe for Jedi to slaughter. With no help from the divided New Republic, the Jedi stand alone against their seemingly invincible foe. Han and Leia Organa Solo risk deadly consequences with their controversial tactics to bolster the Jedi resistance. And after uncovering a new Yuuzhan Vong menace, Anakin and Tahiri find themselves wanted for murder by the Peace Brigade. To avoid capture, they jump into hyperspace - and into far graver trouble.

No longer content with the destruction the Yuuzhan Vong have already sown, Warmaster Tsavong Lah has demanded the heads of all the Jedi. The Jedi Knights are in terrible danger, and none more so than the young students at the Jedi academy on Yavin 4. Impatient, and figuring that forgiveness is easier to come by than permission, Anakin Solo takes off for Yavin 4 in his X-wing.

Leia Organa Solo, estranged from her husband, Han, oversees the evacuation of refugees on planets in the path of the merciless Yuuzhan Vong. Luke Skywalker struggles to hold the fractious Jedi Knights together, even while one of them undertakes a bold but reckless undercover mission. And Han Solo stumbles into the dark heart of a raging battle.

Merciless attacks by an invincible alien force have left the New Republic reeling. Dozens of worlds have succumbed to occupation or annihilation, and even the Jedi Knights have tasted defeat. In these darkest of times, the noble Chewbacca is laid to rest, having died as heroically as he lived. A grief-stricken Han Solo is left to fit the pieces of his shattered soul back together before he loses everything: friends, family, and faith.

It is a solemn time for the New Republic, as the merciless Yuuzhan Vong continue their campaign of destruction. The brutal enemy has unleashed a savage creature capable of finding and killing Jedi Knights. And now Leia Organa Solo faces a terrible ultimatum. If the location of the secret Jedi base is not revealed within one week, the Yuuzhan Vong will blast millions of refugee ships into oblivion.

It is a perilous time for the New Republic. Just when unity is needed most, mistrust is on the rise. Even the Jedi feel the strain, as rogue elements rebel against Luke's leadership. When alien invaders known as the Yunnan Vong strike without warning, the New Republic is thrown on the defensive. Merciless warriors, the Yunnan Vong glory in torture. Their technology is as strange as it is deadly. Most ominous of all, they are impervious to the Force.

As the Jedi and the Republic focus on internal struggles, a new threat surfaces beyond the farthest reaches of the Outer Rim. An enemy appears from outside known space, bearing weapons and technology unlike anything New Republic scientists have ever seen. Suddenly, Luke, Mara, Leia, Han Solo, and Chewbacca, along with their children, are thrust again into battle. But this time, all their courage, sacrifice, and even the power of the Force itself, may not be enough.