Spoiler Level: High
A pretty straight- forward follow up to the previous episode. There's still talk of Anakin being the Chosen One, but now that that's been established the story is focusing completely on the power struggle between the Son and the Daughter.
The Son wants Anakin to join him, tipping the scales to the dark side. To bring that about, he abducts Ahsoka and infects her; not so much turning her to the dark side as much as just "turning her bad," and then finally killing her. It's actually a good ploy, since we know it's Anakin's fear of losing his loved ones that will in the end tip him over to the dark side; but while Anakin does show desperation at Ahsoka's imminent demise, he faces it much stronger and with more resolve. Of course, he also refuses to let it stand, and his ability to be the vessel that the Daughter uses to heal Ahsoka may be another element that leads to his later overconfidence that he should be strong enough in the Force to turn back death in Revenge of the Sith.
So all in all it's a good story and a very enjoyable episode, but I'm a bit disappointed that it doesn't follow up on the implications of Anakin being the Chosen One and exactly what the Prophecy is meant to be.