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.

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.

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.

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.