This walkthrough is for Case File 04: The Masquerade in Gotham Knights.
4.1 – Mark Hendricks
In the Belfry interact with the Evidence Boards to learn Mark Hendricks’ last known location. Next, exit the building and head to the southwestern corner of Tricorner Island. At the objective, you’ll find a crashed car. Head west towards the water to find some enemies. Defeat them to protect Mark then speak with him. Afterwards, return to the Belfry.
4.2 – The Orchard Hotel
Leave the Belfry and make your way to the Orchard Hotel in the western part of Otisburg. Enter the hotel via a door near the top of the building. Once inside, sneak to the ballroom, avoiding detection. Continue into the security room and disable the security system then return to the ballroom. Eavesdrop on the various groups of people to identify Court members. After discovering all the voices, you’ll be tasked with locating the leader of the Court. Follow along the linear path to eventually end up in an air duct where you’ll trigger a cutscene. Afterwards, leave the room via the doors to enter the hallway. Head to the end to reach a stairwell then take the stairs down to the 13th floor. Towards the bottom you’ll find the secret owl door that you’ll need to analyze with the AR. This will then give you a prompt to open the door. Do so then begin your search of the 13th floor. There will be 3 music boxes to interact with and an owl statue to examine. After interacting with the owl statue, a hidden entrance will be revealed. Head on through, dispatching of some Court members in the next room, and interact with the music box. When you’re ready, interact with the touchpad next to the giant map. Next, use a USB to pull some data from the Court of Owls. After removing the USB some goons will show up. Defeat them then head to the next room to find a puzzle. When facing the statues with your back to the door, step on the gold disc in front of the statues in the following order: 4, 2, 1 and 3 (with 1 being on your left and four on your right). This will open another hidden door, allowing you to continue deeper into the building. When you reach a room with a conference table, a cutscene with the Voice of the Court. After the cutscene, return to the ballroom, defeating the enemies as you go. When you reach the ballroom, fight off the waves of assassins. Once done, return to the Belfry.