Everything begins when Frances, a young woman who has just moved to New York, finds an abandoned bag on the subway. Her curiosity leads her to return it to its owner, Greta, an enigmatic elderly woman living in a lonely apartment. Greta, easily charmed by Frances's kindness, establishes a quick connection that seems harmless at first. However, what starts as an unexpected friendship soon turns into a terrifying nightmare.
As Frances becomes more involved in Greta’s life, she uncovers the disturbing obsession that Greta has with relationships and loneliness. Trapped in a cycle of grief and despair, Greta begins to manipulate Frances's life, revealing her darker side. With unexpected twists and an atmosphere of growing tension, Frances finds herself ensnared in a web of manipulative lies that endangers her mental health and safety.
Things become more intense as Frances tries to escape from Greta, who is unwilling to let her new friend slip away so easily. The story explores themes of friendship, betrayal, and the impact of loneliness on people's lives. With a stylized approach and captivating performances, the film grips you, taking you on a disquieting journey where nothing is as it seems, and friendship can become the greatest threat. The tension escalates to a climax, leaving you on the edge of your seat.