The Kill Switch: A Tucker Wayne Novel    by James Rollins & Grant Blackwood Order:  USA  Can William Morrow, 2014 (2014) Hardcover, CD, e-Book     Reviewed by Bob Walch Sigma Force recruits Tucker Wayne and his military working dog Kane were introduced in Tracker and Bloodline. Now the two have been spun off into their own new series created by James Rollins and Grant Blackwood. Tucker and his canine buddy are recruited to carry out a dangerous mission in Siberia where a pharmaceutical expert, who holds the keys to a loathsome, biological weapon system, must be rescued before he divulges the secrets which could spell a total upheaval of the existing world balance. Of course, one misstep and the whole assignment will turn into an international disaster that would cost Tucker and his dog their lives. Pitted against a shadowy Russian military man and his accomplished team of assassins, Tucker and Kane will be tested to the extreme as their perilous journey takes them from the frigid Siberian wilderness to the savannahs of South Africa, mountainous Namibia and then the ice covered Great Lakes in the heart of America. Readers who have enjoyed the Sigma Force series will not only find this an entertaining thriller, but the collaboration of these two accomplished authors also adds another dimension to this exciting series. Note: Opinions expressed in reviews and articles on this site are those of the author(s) and not necessarily those of BookLoons. Find more Mystery books on our Shelves or in our book Reviews