Thanks to @JustDolling , I read "Shadows in the Glasshouse" and I loved it! So thanks for the great suggestion, @JustDolling ! I finished it in one day, and it was really cool. I love how in the end, Merry gets reunited with her sister. That is such a wonderful happy ending.
I've always loved stories with happy endings, except for the bad guys. When the bad guys get a happy ending, it usually means they defeat the good guy, which is awful, and no one wants that to happen. Anyway, the book was awesome, and I think I'll read a lot more AG mystery books.
My favorite one is "Secrets on 26th Street". Tell me your favorites in comments!