Let a threatened character infer a deadline from the preparations being made around them.
Dracula: Chapter 4, journal entry for May 19 and the three postdated letters.
Harker knows he is trapped but still hopes to prolong his opportunities to escape. Dracula wants letters for people outside the castle.
The Count orders three letters describing stages of Harker’s departure, with future dates. Harker complies to avoid provoking him and interprets the final date as the limit of his remaining life.
Harker’s conclusion is his interpretation of the dates, not a narrated guarantee of Dracula’s precise plan.
Chapter 4, journal entry for May 19 and the three postdated letters. ↗
Selected passages: Chapter 4, journal entry for May 19 and the three postdated letters.
The letters tell people outside the castle a story about Harker's movements before those movements have happened. Harker reads the dates as clues to how long he may remain useful. His conclusion is uncertain, but it gives him something specific to act on: a date to investigate or beat.
Write what an antagonist wants outsiders to believe. Choose one necessary preparation the protagonist can notice, such as a scheduled message or a room booked under their name. Separate what the document proves from what the protagonist fears, then give them a way to test one part of that fear.
Use in my storyMake a running joke develop: each attempt to get rid of a nuisance should inconvenience a different person in a different way.
Make another attempt more frightening by having the danger damage the very ability the character needs to escape it.
Keep several failed attempts interesting by making each fail because of a different person's motives or assumptions.