This book made a big splash when it first came out in 1978 because the subject of the cloning of humans was viewed as evil. The more controversial aspect of it was that it was written as a true story with privacy of individuals involved protected so it was impossible to be scientifically confirmed or verified. That was the environment in which I initially read this book. Re-reading it now it doesn't seem so earth shattering and a lot of the shock value has been dimmed. But it still tells the story as more of a factual documentary than fiction. It's an oldie and somewhat dated but was still an entertaining read.