The Duncan family receive a clear message that an imminent inter-family war looms on the horizon. Sonya's husband and Elijah's boss, the incarcerated assassin Brother X, arrive.

The Duncans all turn up the heat in their search for Brother X, while Harris takes one for the team to get the job done. Bernie finally shows his true colors.

As the war intensifies, Orlando sits down with Elijah just as one of the Duncan faithful goes down in a blaze of bullets and a family member is taken prisoner.

Orlando vows to get revenge for Kennedy, Sasha's captors try to get information out of her, and the Duncans seek support in their war against the Brotherhood.

There are wedding bells in the Duncans' future as Junior prepares to pop the question. Niles and Paris reunite and Donna Duncan returns to make Chippy's life miserable.

Things spin out of control for the family as London teams up with Sasha in an attempt to hunt down Brother X and Elijah. Meanwhile, Paris is in Europe.

Junior and Sonya make landfall in Cuba, Chippy and Nevada take a trip and Consuela seeks protection from her husband Alejandro. A mysterious figure named Sage is introduced.

Brother X fails to assassinate LC and Chippy. However, things are far from over, as he has accidentally captured a Duncan during the attack. Paris, London and Sasha launch a rescue mission.

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The Duncans deal with a shocking revelation about their enemy and LC sits down with the underworld leaders to discuss the future of HEAT while new threats appear.

As his sons hunt down Brother X, LC decides Elijah's fate. Meanwhile Billionaire Alexander Cora plots against the unsuspecting Duncans to take over HEAT.