"The Black Temple" by Mohmed Tukur Garba.

Mansir (a native of Kofir in Kano State, Nigeria) is a poor man whose father works as a gardener for a rich family. One day, his employer's spoilt sons ask him to pluck fruits for them against their father's wishes. When Mansir's father refuses, one of them (Daudu) throws a stone at him, blinding him. The owner of the garden throws out Mansir and his sister after their father's death. The sister becomes a prostitute in Kano city.

Mansir later leaves for Lagos in search of greener pastures with one Ibiang. Ibiang introduces him into a secret society, "The Black Temple" (camouflaged as "The Amoto People's Church" during the day). The cult- cum-church is headed by "The Father" and participates in smuggling and human sacrifice. 

Mansir returns to Kofir 2 years later, wealthy. To settle an old score, he takes Daudu with him to Lagos, stabs him to death and brings his heart and blood to the Black Temple. Ibiang,too, donates his niece who lives with him. The police find Daudu's body in the street and begin investigations but their chief (Biodun) is uncooperative. 

After some time, Mansir becomes tired of the Black Temple and decides to quit. However," The Father" says he must return all he acquired after joining the society, including his wife and son. Out of desperation, Mansir goes to the church and shoots "The Father" on the pulpit. He has earlier contacted the police, who later swoop in to search the church. They find stolen goods and the list of the names of the members. Among the names are "Chief Biodun, Linivia Island Police" and some other influential persons. When Inspector Nur phones Chief Biodun to tell him,he decides to shoot himself to prevent being caught alive. The policemen bomb the building used by the Black Temple. 

Inspector Nur commends Mansir for his efforts but says he'll have to spend 3 years in prison. At least, that is better than death, which is the fate of a murderer. He also has a restaurant to return to.