In September 2006 two modern aircraft collide in Brazilian airspace. With 154 people dead investigator Colonel Rufino Ferreira is under pressure to find out what went wrong. But with the skies so tightly controlled he is left dumbfounded. Why didn’t air traffic control prevent the collision? Could pilot error be to blame? He finds that these lessons should have been learned a decade earlier in India and in a terrifying event in the skies over Japan.