You must enter Lady Howard and Madeline's room. If you fail to enter while Roxanne is cleaning, you can jump onto the balconies by exiting through the window in Gabriel's room.

Madeline's Room
After returning to the hall, wait a few moments, and Roxanne will emerge from Emilio's room and move her cart to Madeline Buthane's room door. Again, she'll go through the same routine. She'll first position the cart in front, blocking the door, while she changes the bed sheets. She'll then return to the cart, move it, and retrieve the cleaning supplies. When she returns to the room, head inside. As you enter, you'll watch as Roxanne moves into the bathroom to clean it. There's no dumbwaiter inside Madeline's room. Instead, spot the balcony doors on the far side of the room. Use your mouse cursor on the balcony doors and exit onto the balcony. Wait until Roxanne leaves the room, and Gabriel will automatically exit back into Madeline's room. Approach her room's front door and place your mouse cursor over the lock on the door. Open up the verb menu and select unlock. Now, you can return to Madeline's room later in this time block and investigate. Exit back into the hallway.

Next: Day 2, 10:00 am, as Gabriel (cont.)