Heli describes us the difficult situation of teenager, Heli and his little sister, Estela, in Mexico. A drama that starts with the relationship of Estela and a young boy who trains for being a cop. The last one finds two parcels of cocaine in an abandoned place and hides them on the roof of Estella's house. Their lives are in danger now and no one can help them as drug dealers arrive there and kill Heli's father. Living and die in Mexico is always a matter of luck for poor people who have to survive in difficult situations. Most of them often turn into illegal activities and police is corrupted as also government. Direction was realistic and the cast is really interesting. A great production that won the prize for best director for 2013 in Cannes festival.