My thanks to Dr. Brian Connolly and Dr. Jennifer Frank for their consults on the clinical story line.
To Dr. DeWolfe Miller for his tutoring on the darkness and techniques of deep mountain lake dives.
To Dr. Yasmine Ayroud for her advice on the state of a body after it spent twenty-seven years in the mud of a deep mountain lake.
To Johanna, Betty, Connie, Anne, and Arnie for their editorial comments.
To my agent Denise and her staff Maura and Joy for all their support.
To publicist Nancy Berland for her enthusiastic encouragement.
And to my marvelous editor at Ballantine, Pat Peters.