 The Winchesters investigate a spate of murders committed by people who were apparently visited by an angel and told to carry out "God s will" and kill those who have sinned. For Sam it s easy to believe it to be the case. Not so for easy Dean, who believes they re dealing the confused and angry spirit of Father Gregory, a man murdered on the steps of his church in an attempted robbery. While checking up on a lead Sam is visited by the angel and told to kill someone.