"The Chaser" is a short story by John Collier that explores themes of love, desire, and the consequences of one's actions. The plot centers around a young man named Alan Austen, who is infatuated with a woman named Diana. He seeks the help of an old man who sells a potion that promises to make her love him. As the story unfolds, Alan learns that the potion is not just a simple love elixir; it has darker implications. The narrative highlights the irony of seeking love through manipulation, ultimately questioning the true nature of affection and the lengths one might go to attain it.