 The series begins as Paul Callan (Skeet Ulrich), an investigator of modern miracles for the Catholic Church at the Archdiocese of Boston, is feeling frustrated with disappointing groups of believers each time he investigates and disproves the authenticity of a supposed "miracle".Upon the advice of his mentor, Father "Poppi" Calero (Héctor Elizondo), Paul takes a sabbatical.Months later while doing humanitarian work in Arizona, Paul receives a phone call from Poppi asking him to investigate the case of a young boy with supposed healing powers in the nearby town of Cottonwood.