The Ebay Guardian — Charles A. Salter

A cancer victim dies after receiving too much radiation in a dreadful hospital mistake. A desperate patient turning to radium treatments for alternative healing is instead killed by his excessive doses. A chemist working with a vat of plutonium dies after a sudden pulse of neutrons. Brad Stout, a US Army major and expert in radiation defense at the military's premier radiation defense lab, is assigned to monitor online sales of radioactive materials in an effort to prevent terrorists from accessing items that can make dirty bombs. In previous encounters with the terrorist gang known as the Brood, Brad has barely escaped with his life. Now they are back in The eBay Guardian, and as Brad investigates several suspicious dealers he encounters another eBay tracker who calls himself Curmudgeon Lee. Is this enigmatic character friend or foe? Forging an uneasy alliance they uncover a plot to assassinate a top government official in a faked hospital accident. But who? When and where? And can Brad trust the eBay Curmudgeon or is this all a trick to take Brad down instead? Brad's Cajun family return to help and all secrets of the mysterious WWII diary are at last revealed in this astounding conclusion to The eBay Detective's first trilogy!