Logline. Or pitch, hook, short blurb, whatever you want to call it. I dread them. As much as I dread writing a query or synopsis. Alas, it's almost inevitable to avoid en route to publishing and I admit is a great exercise in getting to the meat of your story.
A logline needs to mention your unique main character, inciting incident, conflict, goal, stakes. And don't forget to include a sense of the story, genre, and voice. Usually in one sentence. Yep.