The title of the book is, precisely, the last words said man wrote in his diary.

From what Caroline wrote in her diary, she'd obviously heard.

Then, the office of president, Washington wrote in his diary, "fell upon me."

She remembered writing it in her diary on September 4, the first day of school.

I've written in my diary most nights for the past three years, she thought.

Or perhaps, as the author wrote in his diary, someone else is living our lives.

"Only one thing is certain," he wrote in his diary for September 5.

He wrote that day in his diary, "The light has gone out of my life."

He tried to find an hour every day to write in his diary.

He then walks to school while writing in his diary.