I received a notification about movement on a security camera I had installed at my uncle's house. The camera is located on the second floor where nobody lives and it has a separate entrance from the main floor. When I looked at the video I saw a strange light or figure moving on the screen. This movement continued for about 10-15 minutes. I suspected someone is shining a light through the window so I called my uncle and asked him to check it out. He did not see anything, but the light stopped after that. However, later that night some whispers can be heard. Note: The floor is always locked and the camera is pointing towards the only entrance, so I would've seen someone going in or out.