Twelve years ago, eight friends ran an exclusive group at university: The Masquerade Murder Society. The mysteries they solved may have been grisly, and brilliantly staged, but they were always fictional -- until their final Christmas Masquerade, when one of the group disappeared, never to be seen again. Now our young, privileged cast of old university friends are summoned to the depths of Scotland for a Christmas-themed masquerade party. But all are hiding something deep below the surface that could make or break their careers. If the group hopes to win the game and survive until Christmas morning, they will need to face the truth about their history together and who they have become -- and what really happened on that fateful night twelve years before.