Escape from the slave-traders

This book takes place in Africa and is about 2 boys that are captured by slave-traders, along with lots of others that are from a different tribe. The slave-traders bring the to David Livingstone, but instead of enslaving them, he saves them and heals their wounds. I rate this book 3 out of 5 stars. This book was okay because this book didn't tell much about what happened after they were saved.