The Vertical Plane
Subtitle: The Mystery of the Dodleston Messages, a Bizarre Record of Communication Through Time
Publisher: Harper Thorsons
Published: 1989,  2017
Format: paperback
Number of pages: 352
ISBN-13: 9780008288334
Description: For a period of two years, Ken Webster found himself in the extraordinary position of corresponding directly with an individual who had lived on the site of his own cottage four centuries earlier. The correspondence began with messages left on his home computer on the kitchen table, and ended with communications scrawled directly onto paper. Fully prepared for some form of elaborate hoax, Webster found to his consternation that the language of the messages tallied precisely with 16th century English usage.

The Vertical Plane is a riveting personal experience of an inexplicable fault in the fabric of time – and a moving account of a relationship mediated across four hundred years.
Notes: There is a 43 minute video made by Nostalgia Nerd about this book:

This Mysterious Computer Could Prove Time Travel Exists | Nostalgia Nerd
https://www.youtube.com/watch?v=nEDgG5MKndo