What technique does the author use in this excerpt from The Secret Adversary to create a sense mystery in the plot? A man’s voice beside her made her start and turn. She had noticed the speaker more than once amongst the first-class passengers. There had been a hint of mystery about him which had appealed to her imagination. He spoke to no one. If anyone spoke to him he was quick to rebuff the overture. Also he had a nervous way of looking over his shoulder with a swift, suspicious glance.

PLATO

The author uses a flashback
to create a sense of mystery around the stranger by
describing the strange way he had acted when she had seen him before.