This was pretty great. Trippy, weird, and a little dense, but great. I was recommended this story as one of Ianto's first in his timeline (if not the very first), but make no mistake, this is no introductory story and expects quite a bit of the listener, pushing a lot of what we think of these existing characters. This is a big Yvonne story and I really enjoyed it. The whole thing is pretty sinister given what she is doing to Ianto.  It was interesting and worth exploring.  I think this story really hinges on its execution, which was done really well and had some fun with the characters along the way.