Murder Most Holy

In the early summer of 1379 in London, Sir John Cranston, Coroner of the city, is trapped into a wager with Signior Gian Galeazzo, Lord of Cremona, who challenges him to resolve a certain murder mystery within two weeks. Men have been found dead in the scarlet chamber of one of Cremona's manors. They have no mark upon them; they have neither drunk nor eaten poison; there are no secret passageways or entrances to the room. And they all have awful expressions of terror upon their faces.