The Sith training Darth Vader underwent was full of surprises.

And his master, Emperor Palpatine, was far from making it easy for him.

Especially when just days after swearing his allegiance to the Emperor and murdering hundred of Jedi, Darth Vader was shocked to discover Palpatine had another potential apprentice in waiting.

Who was the Grand Inquisitor?

Why had the Emperor kept this student a secret?