Why slaves were fundamental to Islam.

The guidelines set out in the Koran, whose laws provided a level of protection for slaves unique to Islam. They allowed many to be set free and, even as slaves, to accrue wealth and power.

How some slaves fared well as finely dressed concubines, well-educated soldiers, administrators and even wealthy landowners, commanders and kings, whilst others toiled restlessly, agonisingly in date plantations and fields.

Life as a galley slave. Why was it the most agonising and fearful slave-career destiny?

How the slave "value chain" worked throughout Islam, from the cruel, harsh kidnapping of young children by sword-wielding Arab and Cossack horsemen, to slave markets and the relative comfort of a rich master's household.

How some women slaves, as beautiful, manipulative and intelligent concubines, rose to become the most powerful in their societies, second only to the Caliph or Sultan, especially if they could sing.

How a concubine, however beautiful, risked her owner chopping off her head at a whim.

How and why, in 1627, Algerian Corsairs, led by the Dutch renegade Islamic convert Jan Janszoon, invaded Iceland, kidnapping children for sale in Algerian slave markets.

The extent to which the Koran's guidance for owning slaves made that acceptable to Muslims for over 1,000 years - and makes it so for some today.

The unintended consequences of abolishing the slave trade - and how, throughout Islam, it sometimes led to more slavery.

How, to this day, smartphone apps provide online markets, helping illicit slavery to flourish in specific Middle Eastern countries.