I've been through the adventure where I was supposed to be able to free MAzzy from teh cell, but I could never figure out how to open that darned thing. What was I missing?

Is Trademeet worth the adventuring?

SPOILER
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Remember outside the cell, when you were fighting some shadows. One of them used a leather armor. The key is among his loot!
And yes, Trademeet is absolutely worth the travelling.

The shadow jailer drops it he should be next to the cell mazzy is in
but she is'nt worth it all you should do is create your own group all members UNDEADHUNTERS