Any E.L. Konigsburg Opinions?

Ds 10 just read “From the Mixed of Files of Mrs. Basil E Frankwieler” and loved it. I also have “A Proud taster for Scarlet and Miniver” and “The Second Mrs. Giaconda” on my shelf, on recommendations from several lists. 

However, I am wondering if anyone knows anything about Konigsburgs other titles? She (he?) has written a quite a few. Specifically, I’m wondering about inappropriate themes. I’m always skeptical of modern youth literature….

Any feedback is appreciated!

Shawna