Holes by Louise Sachar

Stanley Yelnats’ family has a history of bad luck, so when a miscarriage of justice sends him to Camp Green Lake Juvenile Detention Centre (which isn’t green and doesn’t have a lake) he is not surprised. Every day he and the other inmates are told to dig a hole, five foot wide by five foot deep, reporting anything they find. The evil warden claims that it is character building, but this is a lie and Stanley must dig up the truth.