Another great episode in the Sigma Force saga! I really enjoyed this one - a real page-turner taking you from ancient Greece and the Oracle of Delphi, to Washington D.C. and Sigma HQ in the Smithsonian Castle (a block from where I work in D.C. at the Department of Agriculture), to India, and on to the radioactive wastelands of the Urals and Chernobyl in Russia. Again Sigma force was able to save the world -- with some help from autistic savant children and Gypsies -- from some megalomaniac Russians wanting to change the world by letting loose enough radioactivity to kill millions! Along the way there are also some rogue American spy agencies, killer tigers and wolves, and lots of fascinating ideas such as "remote viewing." I read a book about remote viewing back in the mid-90s and was intrigued by the idea. Overall, a super read. I'm looking forward to the next Rollins novel - "The Doomsday Key" which is supposed to be out in June.