Repercussion of the Golden Witch

Three years ago Ushiromiya George was killed during the annual family gathering. Now the Ushiromiya family gets back together again to celebrate Christmas and to, maybe, close the wounds of the past. However, the culprit is among them and before the night comes, a murder will happen once more.
It's time for Kinjo, the son of the famed detective Gilligan Goldbar, to unearth the truth and bring the murderer to justice.