Talented neurobiologist Ivan Efremov receives an offer to head one of the laboratories of the secret project “Plato”. And he finds himself drawn into the investigation of a crime. The head doctor of a fashionable and very successful psychoneurological clinic was killed. His friend Anton Switalsky comes to Ivan’s aid. Suddenly, Elena Veresaeva, a young, beautiful woman, a neurosurgeon and... a patient of the deceased’s clinic, intervenes in the investigation. Ivan cannot even imagine what the Plato project, the favorite brainchild of his adored teacher Ilya Nikolaevich Vidder, is actually doing.