I have read bits and pieces of How Should We Then Live and it is very intense. I think it’s a great book with great information but it is definitely a hard read. If I decide to have my daughter read it, I will spread it out over a long period of time to keep the readings very short so as not to be overwhelming.
I have never read 7 Men Who Rule the World From the Grave but it seems much more readable IMO. I wonder if they have it for kindle so you could read a free sample?
I think I would start with 7 Men and save How Should We Then Live for 11th and/or 12th grade if it were me.
Alternately, How Should We Then Live was also done in a video format and it is available on youtube for free. I know many people choose this over the book itself.