No... it's not about Morticia, Gomez, Lurch and uncle Fester. It's about our second president and his wife Abigail. The Massachusetts Historical Society makes this one available and according to the web site, values it as one of its "most important collections." It contains digital images of the letters exchanged between John and Abigail Adams, John Adams' diary, and John Adams' autobiography. They are all presented alongside transcriptions for easy reading.
While you may not have a direct connection to this family, I think you'll find them interesting reading.
The direct link: