Robert Heinleins Citizen of the Galaxy (2015) #1

Just outside our galaxy the atrocities of slavery thrive, and young Thorby is just another orphaned boy sold at auction. But when he crosses paths with a mysterious crippled beggar, his destiny is forever changed. Citizen of the Galaxy is an interstellar action/adventure coming of age tale by the 'Dean of Science Fiction'� Robert A. Heinlein!