Watch Gang War Oslo

Many years later, some of Oslo's most notorious criminals reflect on the difficult and often lonely journey to reformation, as well as some of their biggest regrets. Meanwhile, a new group of criminals begin to crop up in an increasingly brutal landscape.

As authorities close in on the suspects behind a murder in Oslo, one fugitive escapes to Brazil. Though a major international effort to dismantle organized crime brings down some of the underworld's biggest players, a new generation quietly rises to take their place.

As crime continues to rise throughout the 1990s, new gangs begin to emerge across Oslo. But what starts as a relatively peaceful coexistence between some factions soon erupts into a highly public shootout, prompting police to launch an unprecedented crackdown on gang violence.

In the 1990s, a new market emerges for debt collectors, whose methods range from relatively harmless intimidation to brutal violence. While some of the most successful collectors revel in their power and a lucrative 50% cut, others begin to question how long this life can last.

As the newly formed Killers gang jockeys for power and its conflict with the Young Guns intensifies, a highly skilled theft network nicknamed the Tveita gang surfaces. Then, the emergence of DNA testing offers investigators a chance at cracking previously unsolved cases.

In 1980s Norway, the streets are ruled by rival gangs the Young Guns and the Outsiders. After arriving from Pakistan, Ali joins the Young Guns, where he is immediately thrust into a life of violence -- and Norway witnesses what is said to be the country's first gang-related murder.