To be avoided at all cost! There are much more serious much better informed books available.
Sometimes dated, often totally off-charts, this book is a collection on semi-baked ideas and paranoid conspiracy theories that do little to explain how and why trans-atlantic slavery developed in the New World. One can of course relate to the generous ambition of the author (dispelling the myth of the European "civilizer", showing slavery for the catastrophe that it was, etc.), but the book itself does not reach the basic level of academic seriousness to succeed in that goal.
The book itself is short, so you'd think the author would go straight to the point, but no, the authors finds the time to dwell on totally irrelevant matters such as the Crusades or the Vikings for several pages. In the same way, whatever one may think about Colombus, he was not the initiator of the African slave trade in the Atlantic so putting his name in the title is misleading and a complete loss of time.
More problematic even are the judgemental inserts peppered by the author all over the book. Worse, most of these commentaries are totally unwarranted. No one of note claims that Africa "needed" the Europeans for anything, the fact is that Northern merchants came and traded manufactured goods for slaves, that's objective and does not require moralistic commentaries.
In his absurd attempt to colour pre-1450 Africa as a lost paradise, the author brings some serious nonsense to the table. I particularly enjoyed the downgrading of African warfare to "skirmishes" as if native sovereigns could amass large armies and conquer massive chunks of Western African mainland without going through some serious "battles". In the same way, the author insists on finding twisted psycho-pathologies lurking behind everybody's actions. Europeans are mad with "racism" and Africans suffer from a crippling "naivety", as if both groups could not be perfectly rational. Reading this book one can be forgiven for having completely forgotten that, at the basis of the slave trade, was a simple commercial choice: cheap labour needed to be brought to cultivate large under-populated lands.
No need for paranoia, conspiracy and mental pathologies, the realty of the cold calculation that led to slavery is terrifying enough. For those who start reading about the subject, I'd recommend a more serious book: Hughe Thomas' The Slave trade 1440-1870.