Hostage, the second book in the Star Wars: Rebel Force series, is called Rebel Force: Hostage. Alex Wheeler penned this novel for young readers, which was made available in January of 2009.
X-7, the Empire's hired killer, is on the verge of finding out who his target is. He has already managed to get inside the Rebel Alliance's highest ranks and win Leia's confidence. However, he still hasn't managed to extract the secret information he requires from Leia.
Leia Organa, after all, is a force to be reckoned with: the Galactic Senate's youngest and most resilient member, and, following its termination, the Empire's most formidable adversary. She has lived through abduction and torture at Darth Vader's hands, but her most recent assignment is the most challenging thing she has ever faced. She is returning to her home.
X-7 realizes that this will give him the ideal chance to eliminate her.