In a tense and suspenseful story, there are many ways that characters can quietly injure themselves or others. Here are some possible plot settings: 1. **Drugs**: Characters can use anesthetics or poisons to drug drinks or food, causing the target to lose consciousness or become physically unwell without knowing it. 2. **Fake accidents**: Creating a seemingly accidental situation, such as deliberately placing slippery objects in the kitchen to cause someone to fall and get hurt. 3. **Precision tools**: Using small, quiet tools (such as blades or needles) to secretly cause harm, making sure no obvious sounds or traces are left. 4. **Psychological manipulation**: Manipulating the psychological state of others to cause them to harm themselves or do dangerous things. For example, using hints, threats, or intimidation to make the target harm themselves in extreme situations. 5. **Environmental traps**: Setting traps in the scene, such as setting up obstacles in a dark place, causing the target to get hurt when you are not looking. 6. **False trust**: Pretending to be a friend, attacking the target unexpectedly at a critical moment, causing physical harm. 7. **Remote attack**: Use slingshots, projectiles and other remote attack methods to harm the target in a hidden place without being discovered. 8. **Information manipulation**: Create a seemingly real threat to lure the target into a dangerous situation, thereby causing harm. These methods can enhance the suspense and tension of the story and make the interaction between characters more complex and interesting.