I am a taxi is a book written by Deborah Ellis.It was published in 2006.
Diego lives with his mom in a jail cell and he works as a taxi running errands for other prisoners. His friend Mando persuades Diego to sell drugs with other people to get money. They do it with 3 other boys. Rock is the leader and Smith is the boss. The boys don't get paid so Diego steals coca paste but gets caught. Mando and Diego run but then Mando dies by falling off a bridge. Diego runs off and finds the Ricardo family.
Continued in Sacred Leaf