THE NUMBER OF THE BEAST was Iron Maiden's greatest achievement, and, accordingly it brought them their greatest popularity and notoriety. Revered by metal fans for their focus on music and reviled by critics for their supposed "satanist" leanings, this record represents the seminal British metal band at their peak. Featuring a track by track examination of the record's original multi-tracks lead by Martin Birch, the album's producer, as well as interviews with rock journalists that put accusations made against the band in perspective, this documentary provides an inside look at one of the best and most notorious metal albums of the 1980s.