The joyful tranquility of a snowbound estate in the Lake District of England is overturned in a moment by a shocking murder. Renowned mathematician and inventor Henry Rathbone - long known to listeners of Perry's best-selling Victorian series featuring William Monk - must put his analytical and creative capacities to the test as he assumes the role of an amateur investigator.

In this delightful Christmas tale, he rescues the holiday with a grace that would impress William Monk himself.