Word of the Day:

: an object, event, or character in a film or story that serves to set and keep the plot in motion despite usually lacking intrinsic importance

The missing document is the MacGuffin that brings the two main characters together, but the real story centers on their tumultuous relationship.

"The story opens … at the funeral of elderly Oleander Gardener…. The childless Oleander has several nieces and nephews…. Questions of inheritance and a mysterious seed pod that each of her heirs receives constitute the framework of a tenuous plot, but these are primarily MacGuffins." — The Publisher's Weekly Review, 14 Mar. 2016

More example sentences

The first person to use MacGuffin as a word for a plot device was Alfred Hitchcock. He borrowed it from an old shaggy-dog story in which some passengers on a train interrogate a fellow passenger carrying a large, strange-looking package. The fellow says the package contains a "MacGuffin," which, he explains, is used to catch tigers in the Scottish Highlands. When the group protests that there are no tigers in the Highlands, the passenger replies, "Well, then, this must not be a MacGuffin." Hitchcock apparently appreciated the way the mysterious package holds the audience's attention and builds suspense. He recognized that an audience anticipating a solution to a mystery will continue to follow the story even if the initial interest-grabber turns out to be irrelevant.