With $50 and a plane ticket to Haiti, one can buy a slave. This was just one of the difficult lessons writer Benjamin Skinner learned while researching his book, A Crime So Monstrous: Face-to-Face with Modern-Day Slavery.

Skinner met with slaves and traffickers in 12 different countries, filling in the substance around a startling fact: there are more slaves on the planet today than at any time in human history. Skinner speaks with Anthony Brooks about his experience researching slavery.

Though now illegal throughout the world, slavery is more or less the same as it was hundreds of years ago, Skinner explains. Slaves are still "those that are forced to work under threat of violence for no pay beyond sustenance."