For those interested in the subject (and who can also read French) I also heartily recommend the most recent edition of Augustin Thierry's Récits des temps mérovingiens [1]. Of course that it has most probably long been surpassed when it comes to historic accuracy, after all it was written almost 200 years ago, but it is very interesting nonetheless for being one of the first books that really put the focus on the Merovingians from a historical perspective that was "scientific", for lack of a better word.
if you do read french, proust’s “in search of lost time” (vol 1) is a lot more accessible and enjoyable than my high school teachers made it sound years and years ago. it even contains a depiction of what a learned engineer should be like.
[1] https://www.fnac.com/a21142694/Thierry-Augustin-Recits-des-t...