Documentary celebrating the 40th anniversary of Deep Purple's double live album Made in Japan and going behind the scenes to find out why it has been ranked the sixth best live album of all time. Featuring footage of the rockers during their `mark two' line-up between 1969 and 1973 and charting the friction and incessant touring the band experienced amid recording the 1972 record Machine Head in Montreux, Switzerland. The film also explores the meaning behind the song Smoke on the Water, while revealing the background to the mystery that lies behind the three nights in Osaka and Tokyo on the heavy metal act's first Japanese tour