I think that the previous review is unfair, or at least misunderstands the purpose of this book. For transparency's sake, i should say that i'm on the Staff of All Souls Langham Place where John Stott is still the Rector Emeritus. But that doesn't detract from my comments i hope. This book has had a huge influence on both sides of hte Atlantic, not least because of Stott's balance, care and range of topics. He would certainly be horrified by the idea that it is simply a collection of his personal views, although of course it contains his own conclusions based on the evidence before him (it would be frustrating if he didn't, don't you think?). This is because he clearly submits to the authority of the Bible - his task is to ascertain the ethical principles that the Bible teaches and then apply them to the various (and sometimes incredibly complex) challenges of our time.
Stott's purpose in writing the book was to fill a huge gap in contemporary evangelical thinking - for too long evangelical Christians have merely sought to 'preach the gospel' and not worry too much about anything else like ethics. Since it was first written in 1984 and subsequently revised several times, the need has remained all the greater (not least because technological advances have complicated ethical decision-making still further). I can't think of another book that provides such a brilliant and accessible introduction. It is not the last word on these issues, but you would do a lot worse than to start here.