Downton Abbey meets Knives Out in the gripping new crime series from the bestselling author where an unlikely sleuthing duo - an under-butler and a foul-mouthed octogerian - hunt a killer in a manor sealed against the end of the world.Cornwall, 1910. On a remote tidal island, the Viscount of Tithe Hall is absorbed in feverish preparations for the apocalypse that he believes will accompany the passing of Halley's Comet. The Hall must be sealed from top to bottom - every window, chimney and keyhol...