True Evil by Greg Iles

In this gripping thriller, a determined FBI agent named Alexandra Morse finds herself embroiled in a sinister conspiracy when she investigates the suspicious death of her sister. As she delves deeper, she uncovers a chilling plot involving a ruthless assassin who uses a deadly, undetectable virus to eliminate targets. Racing against time, Alexandra must navigate a web of deceit and danger, confronting the true nature of evil as she fights to bring justice to those responsible for the heinous crimes.

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