Thanks for sharing this spooky tale!

I really liked this stuff:

• Using the necklace to help us understand the characters. As well as using it to heighten the intensity of the scene.
• The way you described what Button was hearing on the phone. In a small amount of words you were able to give a distinctive sound to it.
• The way the monster was described. Both ambiguous and specific, allowing the reader to imagine whatever springs to mind.

Thing(s) that didn't connect with me:

• The framing backstory is a little confusing. Is Button looking for two missing people or are they looking for Jack? Same thing?
• The recollection of what the boss said interrupted a part of scene that I wanted to be more engrossed in.