Sector IV is a historical romance story set around the Biafra war in a small village in Eastern Nigeria, Nchara. Onyinyechi is to be married to the love of her life, Duke, only to learn of his death that same day. She realizes that she is pregnant for Duke and to save her family from embarrassment, she marries Okwuduwa who can’t have children. Okwuduwa is already married to a woman named Ogechi and he is the richest and most well-travelled man in the village. The war escalates and Ogechi has to make difficult choices even after the war ends.