Heirs of the Force (Star Wars) (Young Jedi Knights)

is book #1 of the Star Wars: Young Jedi Knights.
==Book Description==
Jacen and Jaina. When the Empire died, they were born -- a new hope for a New Republic. The young twins of Han Solo and Princess Leia are now fourteen and enrolled at Luke Skywalker's Jedi Academy on Yavin 4. Together with friends both old and new, the future heroes of an already legendary saga begin their training. — While exploring the jungle outside of the academy, the twins make a startling discovery -- the remains of a TIE fighter that had crashed years ago during the battle against the first Death Star. Mechanical whiz Jaina thinks she can repair it... if they can sneak the right parts from the academy. Meanwhile, their work is being closely watched -- but not by academy eyes. The original pilot, an Imperial trooper, has been living wild in the jungle since his ship went down. Waiting to return to duty. And now his chance has come...
(Description from paperbackswap.com)