What we have here is an adventure that will take your part from about level 11to around... well, probably 12, as this adventure is part one of five parts, but its the forth in the series... Frog God needs to figure out a better way to number these, as this is confusing even my sensibilities.
Confusing as the numbering is, the adventure is well presented and beautifully bookmarked, which is to be expected form a publisher like Necromancer / Frog God. Major points for that.
If you want to check the first part of the series out cheap, Slumbering Tsar: The Desolation Part 1 - The Edge of Oblivion for a balanced party of 7th level characters is available for 2 bucks from RPGNow.
The Slumbering Tsar SagaTM began its journey years ago as a single mega-adventure for the masters of Third Edition rules and First Edition feel, then became a trilogy of adventures, then a trilogy of mega-adventures, and now finally comes to you as a monthly series culminating in a massive book with over a half million words of pure First Edition-style adventure. Updated to the Pathfinder Roleplaying Game to accommodate today's audience of the classic fantasy roleplaying game, The Slumbering Tsar SagaTM brings you 14 chapters, released monthly in electronic format, each chapter the size of a full adventure in its own right (30-50 pages) . Then when the final chapter has been released, the whole will be available in a classic edition, hardcover adventure book.