Book Ends/Tabletop Games

Note that some Book Ends can be spoilers, so beware.

Examples of Book Ends in Tabletop Games include:

Many World Of Darkness sourcebooks both old and new begin and end with information related to a specific event. Mage: The Awakening has a diary in the front from a student, and ends with a letter from the mage who's teaching said student to that mage's last student, who went bad and was responsible for Awakening the student writing the diary. Promethean: The Created has the first and second halves of Mr Verney's interview with a psychiatrist.
The Eclipse Phase intro fiction 'Lack' begins and ends with Sava waking up in a new body and asking what the date is.