Hi, unfortunately this game was removed from the Big Fish catalogue in the last couple of years. Those who have it in their purchase history will still be able to download and play it, though.
In addition to Norwich Caves, Daily Magic's Sable Maze: Forbidden Garden and Yuletide Legends: The Brothers Claus have also been removed, along with Ominous Objects: Family Portrait and Ominous Objects: Phantom Reflection.