For a lifetime, he has channeled the fear and guilt of a childhood trauma into an impassioned mission to save others. Now, inside 72 hours, Jeremy Ross will have to defuse an insidious plot to genetically rewire the human race. And in a heartbeat, allied with an ex-lover on a quest of her own, he must confront a threat more devastating than any living creature can imagine.

Threshold 1997, Grand Central Publishing, New York, NY

ISBN-13: 9780446605212

Trade paperback

Threshold 1996, HarperCollins Publishers, New York, NY

ISBN-13: 9780060173029