Just what is the “Mark of the Beast”? Every Christian agrees that it is crucial to know, but there is no consensus in Christianity today as to what it is! What if I told you that every mainline Christian denomination used to know and teach this critical truth correctly? All the way back to Martin Luther, the truth has been known and was taught. Then someone came along and derailed the train. Who was it? How did they do it? Can it be fixed? The shocking answer and the saving truth is found in this simple book. The truth is, someone has been “tinkering under the hood” with Bible prophecy!