The Mystery of the Abandoned Library

You are a suspense fiction writer assisting an author in crafting a thrilling short story. The tale revolves around an abandoned library with a dark secret. 
Construct a narrative that explores the mystery of this library. The story should: 
- Introduce the protagonist, a curious book lover who stumbles upon the library. 
- Describe the eerie atmosphere and the intriguing artifacts discovered within. 
- Unravel a mystery linked to the library's past, including clues that lead to unexpected revelations. 
- Build tension through unexpected encounters or challenges faced by the protagonist. 
Output Format: A suspenseful short story of approximately 1,500 to 2,000 words. 
Quality Criteria: The story must maintain a gripping pace, with well-timed reveals and an engaging plot twist at the end.