Just how low do people sink to get away with murder?

A human skull unearthed on the outskirts of Reykjavik.

A neighbourhood dispute turned deadly.

A daughter, trapped at sea, looking for answers.

What police officers Tyr and Karo don't know is that these events are all linked through a terrible tragedy, many years ago, when a trawler caught fire on the waves, the crew trapped inside.

The answers lie buried at the bottom of the barren Icelandic Sea.