This is one of my favorite solve it yourself books. Well written, in increasing difficulty, creative, etc. I actually worked through these one at a time because they were interesting enough to put the extra time on my part through. The one-page logic puzzles tossed in for good measure were a nice break--but they weren't part of the mysteries--no logic puzzles disguised as mysteries, which is nice.
My only quibble is the last one (dead judge in the study) I think the judge is laying the wrong way up. I didn't manage to figure that one out and even knowing the solution, I think they have the scene wrong.
However, the rest of the book was very much done well enough I still give it high marks!