Revelation is a book that can be understood, but not easily. It requires deep study not only of Revelation itself but of the entire Bible. That means that most of the time we are concentrating our efforts on specific passages. But there is also value in taking a bird’s-eye view to understand the overall plot of the book.
Second Thessalonians describes a final great deception that will befall planet earth that is engineered by Satan himself. Revelation 13 actually describes in general some of what that deception will look like.