"Because the Time is Near" by John MacArthur
This is an excellent explanation on the book of Revelation.
MacArthur takes each section and explains it in an easy to read and in an understanding way to the average reader. This is essentially a commentary on the book of Revelation for the average person.
MacArthur takes the scripture in a literal way. The Church will be raptured, there will be seven years of tribulation, a literal 1,000 year millennial Kingdom, the final rebellion and judgment, and then the eternal state for all.
This is probably one of the best books that I have read regarding the facts and explanation of Revelation. I highly recommend it to all.