In the yard in 2035, people's life has changed dramatically thanks to scientific progress. The families of people in their everyday existence tightly joined robots that have become loyal and silent helpers. But crimes are committed even in the much-changed world. One of the police officers involved in investigating the murder, in this case the robot is involved, and this cop just can not tolerate them. He comes to the disappointing conclusion of the investigation, was violated the basic law of robotics. This code is sewn into an artificial brain of each robot and it reads as follows: a robot may not injure a human being. Police understand that if artificial machines can violate the law, then the world can undergo terrible catastrophe. After the artificial creation of very dense got used to human society and under competent management they are able to seize power on the planet.