Here’s some more information from the publisher’s site:
Welcome to Death on the Reik, part two of the revised and updated Director’s Cut of the Enemy Within, one of the most highly regarded roleplaying campaigns ever written! Created by legendary WFRP writer, Graeme Davis, one of the original writers of the campaign, the Director’s Cut provides additional material to create an enhanced experience that maintains all the mood and paranoia of the original.
The adventure carries on from where Enemy in Shadows left off, taking your unlikely heroes on a grand adventure up and down the remarkable Reik, the largest river in the Old World and trade route to the heart of the Empire.
Death in the Reik includes a selection of ‘Grognard Boxes’ that add entirely new ways to play through the adventures, ensuring even those who have played the Enemy Within campaign before will find Death on the Reik new and exciting.
The Enemy Within is the campaign all roleplaying game enthusiasts should play at least once in their lives, making Death on the Reik an essential purchase for all gamers.
You might also be interested in my post about the influence of Call of Cthulhu on the original adventure.