Maybe I will write a memoir, perhaps I'll do some essays, or maybe I will write a mystery story.

If you think about it, the historian's task is like that of the detective.

The more I have studied Lincoln, the more I have followed his thought processes, the more I am convinced that he understood leadership better than any other American president.

In Lincoln's day a President's religion was a very private affair. There were no public prayer meetings, no attempts to woo the Religious Right. Few of Lincoln's countrymen knew anything at all of his religious beliefs.

I was able to sit at Lincoln's side and see how he thought and how he acted, and how he felt about what was going on around him. I felt the pressures that were on him. You can see what people were writing to him, how they were nudging him.

Here is Theodore Roosevelt with all his faults and with all his strengths - the devoted family man, the passionate game hunter, the astute politician, the frustrated warrior. This is a deeply moving account of the last years of a very great man.

I love mysteries, and I read them every night before I go to bed.