Who Killed Harmony? (A WKM story)

A mysterious letter ends up on Harmony's doorstep in the middle of the night. She's surprised to say the least when she finds it is from her friend Mark. The surprise was warranted since she hadn't seen of or spoken to the man in at least a year. And now the letter seemed to dictate an invitation... for a poker night at his estate, Markiplier Manor. Deciding to go, Harmony has no clue just what's in store.
(A Damien x Harmony (OC)/ slight Mark x Harmony (OC) story. This is the canon alternate timeline of how that fateful night went down in the AU with my OC Harmony involved for all you Harmony lovers out there. *blows you a kiss*.)