The stabbing death of a priest in his own rectory becomes a red ball, with Ballard and Gharty in charge. Allegations of sexual abuse complicate the case, and the unit searches for two Guatemalan refugees who were living at the rectory. The detectives find the pair and take them into custody as material witnesses, sparking an outcry from the city's Catholics, and Barnfather overrides Gee and releases them. A potential lead on a suspect dries up, and Pembleton and Stivers - who has rotated into homicide from sex crimes - are called to the scene of a second priest's murder as the refugees go missing again.