Another puzzle book, this one contain enigmas and not logico-math puzzles. The enigmas are always presented like they came from a dialogue between Watson and Holmes, it don't really change anything in the end, it's more a less there to make a intro to the enigma. I find it to be more challenging. Some are kind of a word twist in it, and it's in english so you have to think in english. If you're do not speak english as your primary langage, like me, it's even more challenging, but I like it. I like that the epub version as a link at the end of the puzzle that can bring you directly into the solution, so you don't have to go around into all the pages to find it and you don't find it at the bottom of the page, written head down like it's often the case. For those who like enigmas, it's a interesting book!