As someone who normally finishes the Genius over the course of a week or so and with some not inconsiderable help from these forums, I must say that I found this slightly above a Rufus in terms of difficulty and by far the easiest Genius so far.
Having said that, I have been stuck on my last clue, 3D - Perhaps Lewis released initially wicked criminal? (4) - for a day now and can't see it at all - any hints gratefully accepted.
Also, re 24D, I am sure my answer is correct and I can parse it up to a point but I can't see the "upright slab".
Help, please.