First off... Coolest.Cover.Ever.
That said we have a beautifully laid out one shot adventure that is NOT for the faint of heart. Oh, it's a tough one alright, but the challenges within are sure to provide long term gaming memories.
The writing is clean and clear, the maps stylish and effective, the set up brilliant, and the climactic payoff the stuff of twisted nightmares. Wring your hands wickedly, fellow DMs, and join me in a jovial "Muh ha ha!" "Breaker of Chains" is an outstanding D&D challenge sure to terrify your players. I've got a slightly longer review at this link.
[5 of 5 Stars!]