http://www.amazon.com/Gossamer-Plain-Forgotten-Realms-Empryean/dp/0786940247/ref=pd_bbs_sr_1/102-4241132-4672156?ie=UTF8&s=books&qid=1194335566&sr=8-1

I read this a little while ago. The book is a good one but a little disorienting. The characters from Hellsgate Keep populate this world but their expeditions take them to other planes. The end is the real shocker in the book and will leave you wanting more. I can't wait for the next book in the series.