In a dystopian world, as an epidemic spreads through verbal communication, a tyrannical institution pursues a linguist immune to the disease. When the Epidemic Fighting Agency goes after Murat, the only survivor of the disease, the young man is forced to leave the liberated area where he was hiding. Leaving his sheltered area, Murat Siyavuş embarks on a difficult struggle to reveal the secret of the "hot head", the legacy of the disease, in the mysterious places of Istanbul, which is under the influence of the epidemic.