From the front page of the PDF:
Cormyr and its allies need the help of the good-aligned dragons in the upcoming battle against Netheril. The dragons are willing to join the cause, but only if they are first given assistance in retaking the Well of Dragons. Recent setbacks experienced by the Cult of the Dragon make this the right time to strike. The area is still heavily fortified, so a small, covert operation is needed. A Living Forgotten Realms adventure for characters of the Paragon tier (levels 11-20).
This adventure is part of the Desolation series, and takes place just before the events of ADCP6-1 The End and the Beginning.