From the book's back cover:
Welcome to the kingdom’s most notorious jail. Velgate is a panoptic prison, an architectural design so cunning that a single guard can observe all prisoners simultaneously. The inmates can make no move that isn’t monitored, so they have no hope of escape. This terrible and ingenious panopticon houses the land’s most feared and dangerous prisoners.
Enter a certain band of heroes . . .
One of the doomed souls within Velgate Prison is innocent, but the only way to free him is to infiltrate the prison. And if that task isn’t difficult enough, what’s far more challenging is getting out.
What begins as a roadside ambush turns into a prison rescue, and that daring escape takes the heroes somewhere far from home. . . .
The Exfiltrators is an adventure module for characters of levels 5 to 7. It is suitable for use in any fantasy campaign.