Book 5 in the Legacy of the Force series.
Suspected of treason, Han and Leia Solo are on the run, hunted by none other than their own son, Jacen. But though his family sees in Jacen the chilling legacy of his Sith grandfather, Darth Vader, many of the frontline troops adore him, and countless citizens see him as a savior in a galaxy torn apart by too many wars. All Jacen wants is safety and stability for all-and he's prepared to do whatever it takes to achieve that goal... even if it means embracing the teachings of Lumiya, the Dark Lady of the Sith. But there is one final test that Jacen must pass before he can gain the awesome power of a true Sith Lord: He must bring about the death of someone he values dearly. What troubles Jacen isn't whether he has the strength to commit murder, but who the sacrifice should be.
498 page paperback novel by Karen Traviss