Anonymous wrote:My 6th grader has been tearing through Keeper of Lost Cities series.
Yes!! My DD loved them so much last year (6th grade) she actually read them again a second time this summer!
She also loved the series listed by OP, but surprised me by branching out a bit, too. Here are some other series she's liked:
Chasing Vermeer
Hunger Games
Divergent
Spy in the Silver Palace, by Jordan Rivet (and another of Jordan Rivet's series - not sure which one)
Just an FYI, I haven't read any of these except Hunger Games, so I'm not sure how violent they are or whether they include any overt romance/sex or other more YA themes . . . .