A decade ago Brian Cahill became the victim of the greatest tragedy any parent can endure with the loss of his firstborn son, a veteran police officer in the aftermath of a painful divorce, to suicide. Far from the carefree retirement he had envisioned, the devastated father faced a journey back from the brink of utter despair. As the author of numerous opinion pieces and essays on religion, the lifelong Catholic was familiar with the concept that the cross is followed by the resurrection, and...