12 keys, 12 clues and the 12 days of Christmas to solve the murder? The prize is the family home called Endgame House. This a a dark, intense locked room mystery. The MC, Lily, is dealing with memories from her mother being back in the family home. There were quite a few characters, all with their own back story. Some characters dot play fair so will they all survive Christmas? A clever murder mystery and perfect for armchair detective work.