The Kingdom of Fiends is a fictional story about four young members of a missionary group who are abandoned by their church in the gang-infested slum of Tegenalpa in the republic. The group witnesses an assassination of a young boy by the dangerously violent 18th street gang who rule over the barrio. Four teenagers are left at the mission and kidnapped by the 18th street gang. They escape the 18th Steet compound with the help of a female gang member.