Thirst takes place in a small town, not unlike Reykjavík where there is evil lurking around and strange crimes and brutality seem to be daily bread. The film centres around Hulda who is suspected being responsible for the death of her brother, Steindi, and is therefore under investigation by the police. After being released from custody due to insufficient evidence, she has nowhere to turn to. She lingers around in the cold until she sees an elderly man being beaten by two thugs in an alley and comes to his rescue. The elderly man turns out to be Hjörtur, a thousand years old, single and homosexual vampire. A friendship is formed between them and Hjörtur repays Hulda the favor by returning her brother to life with terrible consequences. At the same time they are against the aggression of a cult and the police who seem to be obsessed with them.