Last April news spread around the world of a "slave ship" lost at sea off the coast of South Africa with hundreds of children feared dead. The ship, the Etireno, drifted for days before limping into port and unloading a cargo of children. With no bodies to headline and no chained children, the global media circus moved on. But there were on board 23 children who had been sold into slavery. Olenka Frenkiel meets the children, parents and traffickers involved and investigates Africa's modem slave trade and the routine shipment that went wrong.