Appointed to be a juror in a criminal trial, Inès, a 40-year-old nurse, helps to convict the accused, a man with a violent past. At the end of the trial, she is seized with a terrible doubt: what if she had just sent an innocent man behind bars? If she had just unjustly separated a father from his 8-year-old son, whom he will not see grow up? With the help of a private detective with a strong character, Inès will start her own counter-investigation, which will take her much further than she thinks...