In the quiet town of Mifflinburg, Father Michael Doyle hears the confession of a dying man who calls himself Leo—a retired assassin with 79 kills. Trapped by the sacred seal of confession and Leo’s cunning plan, Michael is forced to become the posthumous executor of the killer’s final mission: unleashing devastating evidence that will topple powerful men. As he grapples with this terrible moral burden, the priest must navigate threats from Leo’s former employers, finding his faith and quiet life upended as he becomes the reluctant conduit for a shocking, nationwide justice.