Plot device
From Wiki @ Karl Jones dot com
A plot device can be anything which moves the plot forward.
Description
A contrived or arbitrary plot device may annoy or confuse the reader, causing a loss of the suspension of disbelief.
However a well-crafted plot device, or one that emerges naturally from the setting or characters of the story, may be entirely accepted, or may even be unnoticed by the audience.
See also
External links
- Plot device @ Wikipedia