He'll instantly blame the Sandrals for kidnapping his son named Shen. This will instantly prompt the droid to go get his master, and his master does come out to speak with you under heavy armed guard. When he asks what you're doing here, tell him you are here on behalf of the Jedi Council. Go to the front entrance of the Matale mansion and talk to the armed droid. Casus is the dead Sandral boy that Ahlan Matale was talking about when he interrupted a Jedi Council meeting when you became a Padawan! You'll need to take this information and go to the Matale's residence, which is located back the other way from where you found the corpse of young Casus. Search the corpse to find some goods, including Casus' diary. When you get to a valley on the right side, you'll find a corpse.
You'll need to go to the far right end of the Matale Grounds, fighting off any remaining Kath Hounds. You'll need to go to the Matale Grounds, which can be accessed by walking past the Rodian selling weapons and taking the first right turn into the next area.
After you begin the quest leave the Jedi Council building and go out to the fields beyond the city and Jedi Council area. This quest automatically begins when you speak to Zhar and Vandar after you complete the 3rd Jedi trial. You should know that much before getting underway. Side Quest: The Matale and Sandral Affair
