Good game.....
I went through TOTL with my crash-n-bash squad (my squad from before I discovered the wonders of ranged weaponry). This took a while, especially since I don't use cheats. There are some battles which will challenge the best adventurers and some neat puzzles which are very different from those normally found in IWD. You volunteer to go to purge this haunted castle for this little halfling gentleman you meet in the inn in HOW. He takes you there (note - stock up on stuff before you go as his shop is not that impressive and the ONLY way out of this add-on is to finish it!) and you get attacked momentarily after arriving. It goes from there. The spirit which haunts this castle (the Luremaster) gives you riddles which you must solve in order to figure out what to do. Normal puzzles in Icewind Dale are find the key, then find the door is goes to. Not so here.