For technical information and advice I am particularly indebted to my friend and fellow writer Chase Brandon, retired CIA operations officer, clandestine services, who provided immeasurable counsel regarding the politics, mind-set, and inner workings of the CIA, and who was instrumental in preparing the formal text for the “Memorandum” itself; and to Anthony Chapa, assistant director (retired), United States Secret Service; Paul Tippin, former homicide investigator, Los Angeles Police Department; noted German mystery writer Hartmann Schmige was particularly helpful in providing information about Berlin and the Berlin police; Norton F. Kristy, Ph.D., gave me valuable insight into the psychological motivations of the characters.
For suggestions and corrections to the manuscript I am particularly grateful to Eric Raab, with a very special thank-you to India Cooper. I am also indebted to my agent, Robert Gottlieb; and to Tom Doherty, Linda Quinton, and Robert Gleason for their continued enthusiasm and support of my work.
Finally, I want to thank Jeffrey Weber, M.D., and Thomas Woliver, M.D., whose caring and expertise made the writing of this book possible.