Where To Stream Expedition Unknown Season 4 Episode 4
The Secret
- Aired January 17, 2018
- 60 Min
- Rated 9.0
- Number 7 Of 160 Rated Episodes
Josh travels all over the US to find the treasures featured in The Secret, a cryptic book published in the 1980s. He meets with members of the book's cult following, who each think they're on the verge of finding one of the 10 remaining treasures.