Bottom line is this: Search for something meaningful in your story. A strong hook, a unique angle, and focus on that particular feeling to kick-start your teaser. Just as your book opens with a tease, so must your teaser. You must open your teaser with a question, but not just any question, your question must be filled with curiosity that speaks to the reader in a meaningful way, an emotional way.
Remember, emotion and story concepts are always at the center of all your marketing. Without these two vital components, your marketing will flatline and die before it even has a chance to breathe.