The MacGuffin is a plot device. Wiki: “The MacGuffin(McGuffin) is an object, device, or event that is necessary to the plot and the motivation of the characters, but insignificant, unimportant, or irrelevant in itself.
Director
and producer Alfred Hitchcock popularized the term MacGuffin and the technique
with his 1935 film The 39 Steps, an early example of the concept. Hitchcock
explained the term MacGuffin in a 1939 lecture at Columbia University in New
York City:
It
might be a Scottish name, taken from a story about two men on a train. One man
says, 'What's that package up there in the baggage rack?' And the other
answers, 'Oh, that's a MacGuffin'. The first one asks, 'What's a MacGuffin?'
'Well,' the other man says, 'it's an apparatus for trapping lions in the
Scottish Highlands.' The first man says, 'But there are no lions in the
Scottish Highlands,' and the other one answers, 'Well then, that's no
MacGuffin!' So you see that a MacGuffin is actually nothing at all.
Bob:
But it is often something. In Pyscho, it’s
the money stolen from the bank by a supporting character. In the Maltese Falcon, it’s the bird, which
happens to be fake. In a romance, it could be a never-sent love letter, a lost
charm, a mythical pearl. It drives the plot. Often it is a good substitute for
horrible things happening to the hero or heroine, IMO. Why, because some
stories are primarily interior driven. Since we need some action to propel the
story and characters forward and something visual other than their pretty faces
etc., the McGuffin serves as a focal point for the readers as an important
reason to keep reading. There is some contention over whether the audience cares
about the fate of the McGuffin. Hitchcock says no. Lucas says yes. I say it
depends on how your story is written and what you hope to achieve. I like a novel
in which there is a “b” story surrounding the McGuffin. In The Maltese Falcon, the bird represents greed and how far men will
compromise their morals. So the “b” story is the corruption of men.
As my grandson informed me, it is important not to confuse the McGuffin with the McMuffin.
It’s a matter of taste.