In the demon lover what details in the lovers last meeting foreshadow a sinister threatening reunion

The cut in her hand from being pressed to the lover's uniform button which gave her physical pain.

Explanation:

Elizabeth Bowen's The Demon Lover revolves around the story of Kathleen Drover and her past lover, who seemingly had returned to haunt her. Mrs Drover felt controlled by her fiance, who was disliked by her family. They did not seem to "regret the man they knew  almost nothing about" when the news of his missing came to Kathleen.

When Mrs. Drover went to her former home to get some things, she found a letter reportedly from her former lover who had come to meet her "at the hour arranged" as they had promised twenty five years ago. And in her memory where she, as a younger version of herself, met the "the soldier in the garden had not ever completely seen his face", she was cut in the hand by his uniform's button. This gave her physical pain, even though it was just a memory. This detail seemed to foreshadow a sinister event that will be their devastating reunion.