An English Murder

The snow is thick, the phone line is down, and no one is getting in or out of Warbeck Hall. With friends and family gathered round the fire, all should be set for a perfect Christmas, but as the bells chime midnight, a mysterious murder takes place.
Who can be responsible? The scorned young lover? The lord's passed-over cousin? The social climbing politician's wife? The Czech history professor? The obsequious butler? And perhaps the real question is: can any of them survive long enough to tell the tale?