Jude Watson has the singular ability to tie in the themes of the Star Wars movies into all her SW books. Too bad she doesn't write "adult" novels... she'd best many of today's SW authors.
These two stories tie in the suceeding generations of Jedi quite deftly. The first, Legacy, has strong overtones of the past coming back to haunt you, but gives insight into the Master-Padawan bond and how that bond helps form both Jed. My favorite story was Secrets, however, with the evidence that Anakin's "failing" may have been more than an isolated event. I would love to see Watson develop this story line into a more philosophic adult novel.
*spoiler* While I was sorry to see Siri Tachi die, her storyline was wonderful and you have to be a little happy that she didn't survive to see the Jedi betrayed. I also liked Obi-Wan's musings that if Qui-Gon had survived, he'd have been able to pinpoint the growing problems among the Jedi to a source (giving more evidence to Qui-Gon's uniqueness).
All in all, a great addition to the SW canon, appropriate for any age.