The Non-Canon Expert explains why Emperor Palpatine and Darth Vader conspired to kill the son of the future Imperial Grand Moff Tarkin, Admiral Garoche Tarkin, as a way to benefit from the services of his father going forward!This is a Legends story for Vader that was seen in the 2011 Legends comic entitled «Star Wars: Darth Vader and the Lost Command». I hope that you enjoy it!