This is a long book: a brick of 900 pages describing and discussing the transatlantic slave trade from the Portuguese start in the mid-15th century to the illegal period in the mid 19th century.
One has to be very interested in history to dwell into Hugh Thomas' immensely detailed historical description of the period. But if one is, this book is a true gold-mine: details about specific shipments and harbours; the lifes of slaves, traders and others who suffered (or benefitted) from the trade; the economic consequences and financial matters; the political and legal implications and debates on abolition. All come to life with an amazing sense of detail! I particularly enjoyed reading the background that got the horrible trade starting, as well as the long debate on its abolition, for which there were already people arguing in the 15th century.
Also, the hypocrisies of the entire trade come to life well in the descriptions, like the arguments of the African slaves being better off as slaves in the Americas than free men in Africa.
Such hypocritical statements are surely what one can learn from today, where there seems to be no less hypocrisy.
Great book, but can be a heavy read if you are only marginally interested in the transatlantic slave trade.