The heroes of the film are an old communist, a modest employee Rimsha and a young scientist Venckus. They first meet in court, where Rimsha is a people's assessor, and Venckus acts as the only witness in a murder case. The witness did not clarify the case, but was completely cleared of suspicion. However, Rimsha does not understand why the witness did not try to prevent the murder, and is convinced of his guilt..
