Mood: The mood of the video appears to be intense and mysterious, with a hint of suspense. The theme seems to revolve around a complex plot, possibly involving investigation or problem-solving, given the title 'OPERATION MAYFAIR'. The emotion conveyed is one of focus and determination, as the protagonist seems engrossed in his work.

Environment: The setting of the video is a library or a study room with bookshelves in the background, suggesting an academic or intellectual environment. The presence of lamps indicates a quiet, focused space, possibly used for research or reading. The overall setting seems calm and studious, contrasting with the potentially intense plot of the video.