I loved the Kingfountain series, though it's been awhile since I read it so I didn't remember a lot of the specifics. While that story followed Owen primarily, this story opens with his birth (which started out as a stillbirth, and I thought that was awfully grim... but stick with it, he comes back. Which, had I known this would be Owen, I'd have also guessed.) It's the poisoner from the original series, Ankarette, who is also a midwife, who speaks the words of power and brings him back. This is Ankarette's story, or at least some of it.
When the story opens, she has already been poisoned herself by her arch villain, Lord Hux, a rival poisoner who hopes to bring her over to the "dark side." Ankarette is fountain-blessed (which essentially means she's been given supernatural giftings) and the Fountain (God, in this world) speaks to her when needed. Like all of Wheeler's heroes, she is uncorruptable--but she is sorely tempted. I felt very sorry for her, that she was locked into service to the royal family she loves, but that meant she was unable to have a family of her own, even as she attends the births of all of these babies when her own womb was shriveled by the poison. A man who proposed to her twice and whom she was forced to reject comes back into her life, and they have to work together to unravel a plot against the royal family.
Since this is a prequel, I already knew how Ankarette's story ends, and therefore how this one could not end. But still I hoped, because she is such a sympathetic character. I don't know if I'd exactly say it ends sad though... it's more bittersweet. Wheeler usually manages to pull that off, by zooming out and showing the bigger (spiritual) perspective, within the context of the fantasy world, to make all of the seemingly negative events seem temporary and potentially even redemptive. That's one of the things I love about his books so much.