The Dreghorn family is gathering for an anticipated reunion in the Lake District of England. The blissful tranquility of the snowbound estate, however, is soon shattered by what appears to be an accidental death. The victim's distraught wife, Antonia, summons her godfather, distinguished mathematician and inventor Henry Rathbone--one of the most beloved characters from Perry's bestselling William Monk series. But questions about the tragic event turn into whispers of murder, sending shock waves among members of the Dreghorn clan, who haven't seen each other in ten years. Now Rathbone must put his analytical and creative capacities to the test as he assumes the role of an amateur investigator. But while searching for clues and mulling over potential motives, he cannot help but wonder: Will another poor soul meet the same untimely end--and be silenced like the night?