The film is based on the first part of the novel of the same name by Fyodor Dostoevsky.

Prince Myshkin returns to Russia from Switzerland, where he was treated in a psychiatric clinic. On the train, on the way to St.Petersburg, the prince meets Parfyon Rogozhin, who tells him of his passionate love for Nastasya Filippovna, the former containment woman of the millionaire Totsky. In St.Petersburg, the prince finds himself in the house of his distant relative – Lizaveta Yepanchina (General's wife), meets her husband, their daughters, as well as the Secretary of General – Ganya Ivolgin. The portrait of Nastasya Filippovna, accidentally seen on the general’s table, makes a great impression on the prince...