In this stunning psychological thriller, David Dun demonstrates that he is that rare breed of author who brings to his very first book, not just enormous talent, but the skill and polish that will remind readers of some of today's most seasoned writers. Like the earlier books of New York Times bestseller Jeffery Deaver, Necessary Evil hurtles along at breakneck speed, packing an intense, action-filled story into a period of time so short it leaves us breathless. During a savage snowstorm, a private jet slams into the rugged California high country. In its wake lies a litter of twisted fuselage, mangled corpses...and enough infectious toxins to wipe out most of humanity. Two people -- an expert mountaineer and a female FBI agent -- find the wreckage and its hazardous contents. Now, they're the target of a dangerous enemy that will kill to keep a conspiracy concealed.