In an era when it seemed possible to measure a band's musical prowess by how 'heavy' they were, they didn't come any weightier than Black Sabbath. This biography tells the story of how they made that dream come true - and how it then turned into a nightmare for all of them. How at the height of their fame, Sabbath discovered they had been so badly ripped off by their managers they did not even own their own songs. How they looked for salvation from Don Arden - an even more notorious gangster figure, who resurrected their career but still left them indebted to him, financially and personally. And how it finally came to a head when in 1979 they sacked Ozzy: 'For being too out of control - even for us, ' as Bill Ward put it. Of course the story does not end there. The next 15 years would see a war break out between the two camps: the post-Ozzy Sabbath and Ozzy himself, whose solo career overshadowed Sabbath to the point where, when he offered them the chance to reform around him again, it was entirely on his terms. Or rather, that of his wife and manager - and, to add a further bitter twist to the tale for Sabbath, daughter of Don Arden - Sharon Osbourne.

The final word on the only name synonymous with subversive heavy metal - Black Sabbath.