The TV series "Bullet" is a Russian crime detective. Due to the fault of a criminal, the mother of Major Romanov is killed. Twenty years have passed since the tragedy. Kirill serves in the GRU special forces, but unexpectedly receives a strange letter from the imprisoned killer. The killer swears that he is not involved in the woman's death and promises to help find the real culprit. Confused, Kirill resigns from service and goes to the capital in search of the truth. He begins his investigation and gets a job at the company where his mother worked.