Crafting an Engaging Short Story with Unpredictable Plot Twists

Imagine a world where memories can be transferred from one person to another. A young woman named Sophia receives a mysterious box containing memories of a life she has never lived. As she delves deeper into the memories, she discovers a hidden world where people trade and sell their memories like commodities. However, Sophia soon realizes that the memories are not what they seem, and she must navigate the dark underworld of memory trading to uncover the truth. Write a 1,000-word short story with a non-linear narrative structure, incorporating 5 unexpected plot twists that will keep readers guessing. The story should be character-driven, with a strong focus on Sophia's emotional journey. 

Example output:
The box arrived on a typical Tuesday afternoon, its worn wooden surface adorned with a small, intricately carved lock. Sophia's heart skipped a beat as she grasped the handle, a mix of excitement and trepidation coursing through her veins.