Chains by Frances Mary Hendry
Juliet wants to prove to her father that a girl can be just as good as a boy when it comes to business and so she changes places with her brother and sets sail on her father's ship on its next voyage to Africa and America. But Juliet's adventure turns into a nightmare when she realizes the full horror of the trade her father is engaged in - the slave trade, at its height in the late eighteenth century. BLAn exciting story dealing with important issue of slavery in context of a very readable, swashbuckling adventure story.