From the Marry Ferrell web site:
“The concluding chapter of Bill Simpich's new book State Secret: Wiretapping in Mexico City, Double Agents, and the Framing of Lee Oswald is now available for reading online here at MFF.”
This is the 7th and final chapter in Bill Simpich's online book involving the Mexico City operations. It’s a recommended and detailed accounting of this phase of Oswald’s life just before the assassination.
You can start here at the beginning with the Preface to start reading all 7 chapters: