"Not For Sale: The Return of the Global Slave Trade -- and How We Can Fight It." The back cover of this book by David Batstone has some alarming statistics: "Human trafficking generates $31 billion annually and enslaves 27 million people around the globe, half of them children under the age of eighteen."
Not For Sale paints heart-wrenching pictures of abuse and bondage in today's world. Written in a unique format, the book looks at several areas of the world, including the United States, and juxtaposes stories of slavery with stories of abolitionists.
I highly recommend this book. You will not look at the world the same again after you read it.