It mentions a "more spiritual" version of the Gospel of Mark.

The original book was moved to Athens and the letter has since "disappeared," leaving only Smith’s photographs.

💡 While the "Secret Gospel" provides a fascinating glimpse into early Christian mysticism, its status as a "missing link" is stalled by the lack of a physical manuscript to test. If you'd like to dig deeper, let me know: Should I focus on the specific verses quoted in the letter?