Briefly describe the plot in the film la historian oficial

The film is based on the end of the Argentinian "Dirty War", where the time of the 70's and the 80's brutal military dictatorship where 30,000 citizens either died or disappeared.  The story of this film is concentrated around a high school teacher who learns the identity of the biological mother of her adopted daughter.  

Go to the right. go left. go right. go straight.