In "The Plague", Albert Camus writes, "All I maintain is that on this earth there are pestilences and there are victims, and it's up to us so far as possible, not to join forces with the pestilences." (Camus) What is writing about does not differ so much from a love triangle as we see in "Casablanca". Love can be seen in "The Plague" in many different examples. For instance love of others (romantic or otherwise), love of state, love of an ideal, or there can be love of self. After careful consideration, although not as apparent as in "Casablanca", love my very well be the theme of Camus' work.
Time father Paneloux says that 'Religion in a time of plague cannot be ordinary religion.' The same goes for morality.