Michael A Stackpole 
Star Wars: Dark Tide Onslaught 

Twenty-one years after the destruction of Darth Vader and the Emperor, the Star Wars galaxy has been hit by a threat more deadly than anything that has gone before. In VECTOR PRIME, aliens invaded from outside the galaxy and were routed. . . at great cost to our heroes. Now, in a climate of mistrust – especially of the Jedi – Leia cannot convince the New Republic that the threat may not be over, even as the next wave of alien warships are entering the galaxy. . . It is up to Leia, Luke, the Solo kids – Jedi Knights all – and the few who believe to defend the Outer Rim planets from invasion!