Later on, all the tests have come back negative. The Cottages are at a loss to explain what's wrong with Emma, but House has an idea. He heads into Emma's room and tells her that they've tested her for everything and found that her body is functioning perfectly. So why are her kidneys failing? "The other body isn't," House answers. "There's something wrong with the fetus." Commence tragedy.

After the commercial gives us all time to let this grave news sink in, House writes his diagnosis on the board: Maternal Mirror Syndrome, the "mirror" part written in a most clever backward fashion that I'm sure Emma will appreciate once she gets over her baby dying and everything. House metaphors that Emma's body is like a German metro system, which is sure to be the most efficient of all metro systems. Then a new station full of rookies who don't know what they're doing opens up, and that throws off the entire rail system, resulting in "a bunch of angry Germans with nowhere to go. And we all know that ain't good for the Jews." Chase asks who the Jews are in this analogy, but is ignored. The answer to Chase's question, as we'll soon see, is Cuddy. Or Wilson, since he gets almost no screen time in this episode. House goes on to say that this can, rarely, result in a "timebomb" of a fetus that kills the mother as it's dying. The only way to cure Emma is to figure out what's wrong with the fetus and fix it. Cameron the pessimist says she heard a rumor that the outcome of maternal mirror syndrome is almost always "unfavorable." "Is that doctor speak for 'dead baby'?" asks House, although he does not launch into a series of dead baby jokes. Chase wonders how they're supposed to diagnose a person who weighs less than one pound, and that they can't touch or see. House sarcastically reminds him that they have machines that look through human skin for cases like this. He says that they're only looking at a set amount of things that could be affecting the baby. While Cameron lists off the ones that are curable, Foreman chimes in with all the ones that aren't. Oh, go save a panda, Foreman. Geez. House tells them to start with the fetus's heart. The only problem with that is that the heart moves too fast to get a clear picture of it. Solution: paralyze the heart.