The past catches up with the postal detectives when Oliver leads Shane, Rita, and Norman on the investigation of a package from a son to his estranged father. The team leaves strict new supervisor Cora behind as they race against time to track down the father before it's too late. But when Shane stumbles onto a clue that decodes the package’s true meaning, the Postables discover a tragedy that changes everything. Meanwhile, Cora has a surprising change of heart that inspires the team. (thetvdb.com)