Scandal, murder and treason... Athelstan and Cranston are back with a bang.Winter, 1379. French privateers are attacking the southern coast and threaten London itself, the very heart of the nation.The situation becomes dire when an English flotilla of warships, with the colossal God's Bright Light among them, drops anchor in the Thames; during the first night, the entire watch of the ship disappears without a trace. The series of murderous and strange incidents leads to Sir John and Brother Athelstan being summoned to resolve the mysteries on board the ill-omened warship. Their investigations uncover some shocking truths - and they find themselves in the thick of a bloody battle on the Thames.