Emma Craven worked for a governmental organization which dealt with nuclear products. She was shot with in front of her father – a police detective Thomas Craven. The police start working on this with zeal – they pointed at the father, but shot the daughter. But recollecting the unnoticed details of the tragic evening, Thomas understands that is was Emma who was a target. Analyzing circumstances of the tragedy and motives of potential participants, Thomas realizes that it is unlikely that someone will help him and it is only he who is able to make an act of retaliation for his beloved daughter’s life.