![In Knives Out (2019) all the letters to Linda from her father are written in invisible ink revealed by heat. All her previous letters have a burn mark where she used a In Knives Out (2019) all the letters to Linda from her father are written in invisible ink revealed by heat. All her previous letters have a burn mark where she used a](https://preview.redd.it/rcm280llbdo41.jpg?auto=webp&s=ac280be5e5c4cdf1e1666dae96d3da35af8baee6)
In Knives Out (2019) all the letters to Linda from her father are written in invisible ink revealed by heat. All her previous letters have a burn mark where she used a
![In Knives Out (2019) you can see burn marks on a letter Linda is reading half way through the movie. Explanation in comments : r/MovieDetails In Knives Out (2019) you can see burn marks on a letter Linda is reading half way through the movie. Explanation in comments : r/MovieDetails](https://i.redd.it/cbuzrlqsepw71.jpg)
In Knives Out (2019) you can see burn marks on a letter Linda is reading half way through the movie. Explanation in comments : r/MovieDetails
![In Knives Out (2019), when Richard opens the letter from Harlon to his wife, Linda, the invisible ink is still partially visible before it appears later in the film. : r/MovieDetails In Knives Out (2019), when Richard opens the letter from Harlon to his wife, Linda, the invisible ink is still partially visible before it appears later in the film. : r/MovieDetails](https://i.redd.it/jxgm1g4xrxf41.jpg)