When Benjamin meets Mackie in the woods, he discovers Mackie is one of eight boys enslaved in a hideaway to serve robbers. Can nine young boys outwit 20 invisible robbers with guns and knives? 10 halftones.When Benjamin meets Mackie in the woods, he discovers Mackie is one of eight boys enslaved in a hideaway to serve robbers. Can nine young boys outwit 20 invisible robbers with guns and knives? 10 halftones.