Holes by LOUIS SACHAR

This is a strange story with a happy ending for everyone except the Warden. It narrates what happened at Camp Green Lake Juvenile Correctional Facility (a lie). A boy has been sent there unfairly and he tríes to discover the truth about a secret which has been hidden there for years. 

I loved it because it is exciting and sort of funny because of the boys' silly names (Armpit,Squid! Magnet, Xray, Zero ....).

Thanks to Ms Bowyer for reccomending it to me.