From the module introduction:
Future/Perfect is a series of investigations linked together to form a single unbroken campaign. However, each investigation is self-contained and can be run as a one-off adventure.
The campaign is a great way to introduce new players to the world of Delta Green. They can be brought in completely ignorant of the conspiracy, or with some foreknowledge.
In any case, I hope you enjoy it.
This compilation includes parts 1, 2 & 3. Each part of the campaign can also be played as a stand-alone scenario.
Originally part of a proposed 10 part series of linked scenarios, it has been revised down to four parts. The text of part four has been completed and is scheduled for release in early 2010.