For those writers working on one sheets and quick elevator pitches for their novels, here's a must read blog post on the topic from agent Nathan Bransford....
.... wherein he distills this somewhat daunting process into four basic elements that should be included in the pitch:
Take a look at his post for how he recommends putting those elements together. This is the clearest formula for writing a one sentence pitch I've ever found. And I've done me a lot of looking.
PS: that "complete quest" part could also be stated "reach goal."