While on a routine mission to recover secrets from the reclusive Nightsisters, Sidious is tricked by Mother Talzin into accepting a power even he may not be able to handle. When Darth Plagueis becomes infected with it as well, the Sith Order spins into disarray. But Sith do not give up easily, even if their Grand Plan may require some--recalibration.
After his success in an important battle, General Grievous is made an offer he can't refuse in the form of upgrades to his cyborg body. But the surgery is more than what it seems, and leads to some startling revelations about Count Dooku and Darth Sidious.