When the atheistic ranting of Irish-American author James Mulcahy upsets the inhabitants of the Irish village to which he has retired, a mob threatens him. But moments after he has dared God to strike him dead, a stranger appears and does so. The man, dubbed "Johnny Nobody" by the press, claims no knowledge of Mulcahy or even of himself. He asks the help of the village priest, Father Carey, in his upcoming trial for Mulcahy's murder. While the amnesiac Johnny goes to trial, Father Carey mulls questions of belief raised by the case. And then, the good father learns a little more about Johnny Nobody...
Nigel Patrick
as Father Edward John Carey
Yvonne Mitchell
as Miss Mary Floyd
William Bendix
as James Ronald Mulcahy
Aldo Ray
as Mark Wheeler (aka Johnny Nobody)
Cyril Cusack
as Prosecuting Counsel O'Brien
Bernie Winters
as Photographer
Niall MacGinnis
as Defending Counsel Sullivan
Noel Purcell
as Brother Timothy
Eddie Byrne
as Landlord O'Connor
John Welsh
as Judge
Joe Lynch
as Tinker
Jimmy O'Dea
as Postman Tim
