I took out this book for my husband to read while I accompanied him on my kindle version. I can not comment on the quality of the illustrated edition due to this. He found this one much better than the third book in the series. He enjoyed the plot much more and the ending was not as contrived. He seemed to really connect with the character of Zobrist as he was in agreement with his plan and ideals. I as well found this one in general more enjoyable however found that there were less puzzles than the previous books, and less interesting diagrams on the pages.