State of the suckitude

I'm having real trouble with my WIP. It's not The Buried King; that's on the back burner for now, based on the excellent advice of my agent. At the moment it's A Key, An Egg, An Unfortunate Remark.

There's a solid idea behind the story, and a solid setting to build it on, but as I'm writing it the whole thing feels slack.

And I think I have an idea why. I'm trying something different here, with a main character who is very knowledgeable and competent, and the stakes are both personal and ...