Written by Timothy Zahn, a writer many consider to be not only the greatest writer of Star Wars Expanded Universe stuff, but also the most influential, this story picks up about 3 months after the first one, "Allegiance" finishes.
It has all the same major characters in it, from the Hand of Judgement, to Mara Jade and of course the Rebel Heroes we know from the films.
The story takes place a few months after the events of A New Hope and the Battle of Yavin, and is primarily about the Rebels looking for a new base to set up from, having been chased around the galaxy by the Empire.
As with all Zahn's books, the story is solid and intriguing, with you always wanting to know what's on the next page, the character development is as thorough as you'd xpect and the plot twists that happen every now and then will leave you guessing.
An interesting note, some of the characters who will have a dramatic impact on each other in the future (such as Mara and Luke's wedding) meet each other, however briefly, and it lends the book quite a nice feeling of connectiveness. It's almost cementing itself in the wall of Star Wars lore solely by saying it, you inevitably end up thinking "oh, so-and-so will do that at some point, wow", and feeling almost as if you're privy to some secret.
In all, it is a very good book, with a great name attached to it. If you enjoyed Allegiance, or Star Wars in general, I certainly recommend it.