How does Mary, Mary develop the theme of Romance and Marriage?

Mary, Mary by James Stephens develops Romance and Marriage across the chapters the companion marks for this theme.

Marriage is portrayed as both a remote fairy-tale adventure—with a lord in golden armor—and a mundane reality, as Mary observes ordinary couples and grapples with the idea that romance can persist even in dreary lives, while also facing the policeman's predatory interest.

The policeman's twisted view of romance as possession and his struggle with the conventional path of marriage.