I have to disagree about Whispers - it is far superior to Shadows.
I tried running shadows, but found it a) Railroaded and b) full of inconsistencies. It totally ignores a lot of the key elements that cropped up in Forgotten Forge (The Journal, The Map of the Mournlands, Elaydren's real surname) - it provided poor conflicts and never considered the outcomes if the PCs managed to wipe out the NPCs early (and frankly, the Rose Quarry encounter ought to end with the PCs triumphant, Keith Baker forgot about the rather dramatic effect of Action Points over Challenges.) Not to mention some plain appalling set pieces - one sequence describes characters looking at the reflection of the moons in the water and it is only after a DC 15 check that they realise that there is a fog. Poorly written, badly designed and plain dull.
Whispers, on the other hand, has none of the inconsistency - namely by being its own story - and gives the DM freedom to run the game as he or she sees fit. It is open ended and has some wonderfully dramatic sequences - A chase through a grand ballroom, battle on an airship, fight on the roof of a lightning rail...
All in all, I found it to be the best of the published adventures to date.
Conan