Even now, Iceland has a low crime rate, but "big crime" is yet present, particularly drugs and money laundry related ones. So, from time to time, the police cannot confine themselves to regular constable work, but have to deal with international malpractices and violent management of affairs.
Unlike in Hamarinn where standard issue crime drama story lines and characters were intertwined with (super)natural phenomena and abilities, Hraunið is an "ordinary" crime series where solution is reached without mythological issues or visions. Again, the acting is good, beautifully harsh Icelandic nature visible, but there was still something that fell short for me, falling behind e.g. Ófærð and other films where Baltasar Kormákur is usually involved. Several links between the past and present remained vague, and long chases and shootings do not somehow fit in... Some characters and scenes provided no additional value, and the ending came a bit hurriedly.
But still, if you like Nordic people and nature and expect a kind of thrill and dark forces, then Hraunið lets you spend pleasant hours in front of screen.