An impossible impostor

"London, 1889. Veronica Speedwell and her natural historian beau Stoker are summoned by Sir Hugo Montgomerie, head of Special Branch. He has a personal request on behalf of his goddaughter, Euphemia Hathaway. After years of traveling the world, her eldest brother, Jonathan, heir to Hathaway Hall, was believed to have been killed in the catastrophic eruption of Krakatoa a few years before. But now a man matching Jonathan's description and carrying...