It's been a long while since I read eitehr of those two assassination books. However, their premises (and those of similar works) have been just about rendered null and void by recent computer-based crime scene investigation and analysis. Another good book is Case Closed by Gerald Posner. By the way, there is a webiste entitled Lancer that is an assassination conspiracy site you might want to visit.
"Generosity. That was my first mistake." "Experience must be our only guide; reason may mislead us." "Instagram is Twitter for people who can't read."