A chartered ship off the coast of West Africa caught the attention of the international media on 13 April. Was it engaged in ferrying illegal immigrants or a vessel crammed with a child slave cargo destined for the poverty and cruelty of work on cocoa plantations? Six days later the authorities and human rights workers are still trying to establish who exactly was on board the MV Etireno. Clare Harman investigates the incident and the repercussions it is having on the chocolate industry.