Short sentences to create tension and make the heart beat quickly
Balance short and long sentences
Don’t reveal what makes the noise – keep the reader wondering
Pick out unusual detail to create atmosphere
Mention the darkness or cold
Have the main character ask a question or think aloud e.g. “What was that?” hissed Sam.
Describe the characters reactions to show how they feel e.g. his hands gripped the bannister till his knuckles turned white.