Question

What was the most shocking discovery made by Charley when he was going through the first day covers of his grandfather’s collection? (The Third Level)

Hint:

First day covers are normally blank, but the written message from the past validated Charley’s belief, making it a major plot twist.

Answer 1

Charley, stunned, discovered a first-day cover postmarked July 18, 1894, addressed to him. It was from his psychiatrist friend, Sam, and confirmed Sam had reached the third level and was living in the past, thus validating the third level's existence.
% Quicktip