"After breaking into a secret base, Darth Vader comes face-to-face with his replacements who have mysterious Force-like abilities."--Publisher website.
"Darth Vader battles his replacements under the close eye of the Emperor, and later learns the identity of a certain Rebel pilot that blew up the Death Star."--Publisher website.
"On Geonosis, Darth Vader, Aphra, Triple Zero, and BT-1 explore a droid factory, and a bounty hunter returns with news for Vader... the Emperor plans on replacing him!"--Publisher website.