I also like e-books. I upload a child in the PC. True, he still manages to play on the computer and sometimes deletes files. It is necessary to recover. Suddenly, someone needs it. To recover deleted files there is the program DiskInternals Uneraser
https://www.diskinternals.com/uneraser/. Restored as a family photo over the summer. The younger daughter did not like how she looked and she decided to remove.