Paul investigates modern miracles for the Catholic Church. After he witnesses a true supernatural miracle, only for his findings to be dismissed, he leaves the Church behind and is approached by Alva Keel to join his organization.

Paul Callan investigates modern miracles for the Catholic Church. While working on a case involving a terminally-ill boy who supposedly can heal people, Paul witnesses his true miraculous power but also faces a sinister demonic entity known as Darkness. However, the Church dismisses all his findings, so the ever-more-disillusioned Paul quits and continues his work with private investigators: scholarly Alva Keel, who believes that Paul is on a path to become a powerful force for either good or evil; and his aide Evelyn Santos, who used to work as a cop.