How to write the beginning of a mystery or romance novel?

Suspense and romance novels usually use some suspense elements or plot to attract the reader's attention, such as an unexpected event, a mysterious disappearance, an unusual event, and so on. These elements could be presented by describing the protagonist's point of view, allowing the reader to better understand the plot and characters of the story. Here are some examples of the opening of suspense and romance novels: Suddenly, a voice rang out like a sharp sword hanging in the sky, causing everyone to be terrified. The protagonist looked up in horror and found a black shadow quietly approaching him. He tried to escape from this place quickly, but the door was locked. Her memory was struck by a strong bolt of lightning, and her entire person seemed to have been sucked dry. She tried to recall the past, but her mind was blank. She could only remember some vague images. In a quiet night, a scream broke the silence. The protagonist looked up in horror and found an unfamiliar woman quietly approaching them. She tried to escape, but her body was tightly hugged by a figure. In a dark forest, a strange man suddenly disappeared. The protagonist looked around in horror but could not find him. It was not until he heard a voice that he realized that the man was dead. In a mysterious ancient city, a mysterious figure suddenly appeared in front of the protagonist. He tried to convince the protagonist to join his organization, but the protagonist did not believe him. As the story developed, the protagonist gradually discovered that there was an unspeakable secret behind this mysterious character.