The British Embassy to the UN, suspecting an international conspiracy, asks Margaret Blackburn, the attractive amateur sleuth to investigate a string of murders that spans the globe from Memphis, Tennessee to Brisbane, Australia. The victims are top scientists specialized in bioterrorim research. To accomplish her mission, Margaret has to go to Montreal where she must first reopen the case of Isabelle de Valois, murdered 30 years earlier. The solution of this case is key to the mystery of the murdered microbiologists. This is book V in the series of novels, the Investigations of Margaret Blackburn.