A chance encounter leads FBI agent Mallory Blackwell to investigate the circumstances surrounding the mysterious death of her father, Cutter Wilson, years ago. Their only informant murdered, Mallory and cryptologist husband Alton lead an NSA team on a round-the-world quest to track down the perpetrator of a mysterious toxicological project. The sleuths must summon all their investigatory skills in a desperate bid to follow a trail of clues to the hidden truth of Cutter Wilson’s death, a discovery exceeding their wildest expectations.