The Themes for the book The Slave Dancer?

Jessie is a 13 year-old boy that has been imprisoned on a slave ship. The main theme of this novel is imprisonment. Jessie is taken from his home against his will and put aboard the Moonlight. The Moonlight is a slave ship, also known as a slaver, and he is expected to play a fife to keep the slaves dancing. Jessie hates being a prisoner and he hates being aboard a prison ship. When the opportunity arrises for Jessie to escape during a battle with the Spanish traders he takes a young slave boy with him and they find freedom.