Gloria (1980)

An accountant (Buck Henry) is in possession of a ledger which could put a number of mob bosses behind bars for a long time. Before he is killed, however, he manages to entrust the ledger and his son to a neighbor, Gloria (Gena Rowlands), for protection. Gloria reluctantly takes the kid on the run while keeping the mob at bay, sometimes at the point of a gun. Finally, tired of running, she decides to confront them head on.