I've been looking through TV and movie listings in my Entertainment magazine, a guilty pleasure, and it has really helped me with my one-line-pitch. I've also been reading "Screenwriting Tricks for Authors," by Alexandra Sokoloff and she includes a list of what has to be in the log line to make it successful.
- What is the MC's problem and why is it worthy of an entire story?
- Who is the antagonist?
- What are the stakes? If your MC doesn't do something, why should we care? What is the danger?
- What is the setting or atmosphere?
- Give clues to the genre
Here is my one line pitch:
The Lion Within
YA Science Fiction
Sixteen-year-old Renna Healy was born a rager not part-lion, that happened by accident in Africa, and now she must train to defeat the lion that changed her in order to stop a virus from becoming an epidemic, but first she needs to learn to control the beast within her using the most challenging of places to train--high school.