Your heroine owns a coffee shop. A single man has been coming into her shop every day at the same time for more than a year. They chat, sometimes she sits with him for a few minutes.
They flirt but it’s never gone to the next level.
She decides that today is the day she’s going to ask him out but he never shows up.
A few days go by and a man comes in looking for her missing customer. The man is suspicious. What does your heroine do? Does she go looking for your hero? Where is he? What’s happened?