The year is 1894, and Europe's elite prepare to converge on Coburg, Germany for a royal wedding. Charles, Beth, and all the Stuart-Sinclair clan are invited, but before the Duke can board the train for Coburg, he must investigate a cold-case death in Vienna. This case will lead him into a new web of enemies-human and supernatural. Can he untangle the web of lies without falling victim to Blackstone's newest plots? Does Paul Stuart's assignment in West Africa have anything to do with Blackstone, and what of Cordelia's melancholia? Are her new doctors trustworthy?

Who is behind the league of limping men? Has Legion escaped?