Justice?

What is justice?
Is it the conviction of fairness, of moral righteousness?
If so, by whose standard of fairness?
If so, by whose standard of morality?
Or is it the administration of justifiable punishment?
To be administered by whom?
This novel cuts apart and scrutinizes the shadowy lives, the scandalous history and innermost emotions of two post World War II Italian families coincidentally seeking asylum in Australia's South Coast village of Cringila.
The Panzarroti and Garibaldi families' cross paths after a local steelworker is murdered at Port Kembla Iron and Steel Works in an identical style to a Camorra execution which occurred almost forty years ago in Naples.
The two family's secret feud is exacerbated by the inheritance of one family's fortune over the other, obstructed and dishonourably administered with prejudice by the Capo of the Giordano Clan, one of Naples' most notorious Camorra Clans.
Is Justice simply based on the principle that a person receives that which he or she deserves?
Or is Justice nothing more than a misshapen word conveniently used by anybody to validate their actions?