Book #15 was a wee cheat, in that I read Trixie Belden #6 - Mystery in Arizona. I enjoyed it, but the mystery wasn't all that mysterious or dramatic. Still, there was always a lot going on, and it kept my attention.
Book #16 was Great Restorations, by fandom's own lovely
libby_drew. The characters were to swoon for! *swoons* There was drama and UST and wonderful secondary characters and...why aren't you reading this book?! I promise, you won't be disappointed. Go, buy, read! *shoos you off*