By far the best of the three books in the series. Could easily stand alone as a thriller even if you have not read the other two books although there are a lot of references to previous exploits! This books sees Judith do another array of travel to Azerbaijan, Morocco and back to London where it all began. Certainly keeps your attention throughout and the ending races along which is always a good sign. Felt that the writing was sharper in this one than the previous installments. Would like to go back and read the three of back to back as I though that the first in the series was a little over-hyped but I kept with them to see out the trilogy and I am glad I did so.The ending of Ultima keeps you guessing till the very end with a typical Judith twist!