I Am John Titor by Niamh Arthur

Don't let the price (free) fool you.

"In the world of internet legends, time traveler John Titor is the ultimate prize."

This is a fascinating speculative fiction of real-world internet forums between 1998 and 2001 by an individual claiming to be an American military time traveler from the year 2036, whose posts discussed various aspects of time travel, and described future calamitous events.

Free on amazon.com and oceanofpdf.com.

And for whomsoever is interested, you can read about the "real" John Titor on Wikipedia: https://en.wikipedia.org/wiki/John_Titor

The usual $3 meetup fee applies, to help defray the yearly Meetup fee.