Yanagihara Satoshi - Layton Kyouju - Novel - 1 - Layton Kyouju to Samayoeru Shiro (Shogakukan)

The people of London have witnessed an enormous castle floating in the sky. As many people have been disappearing, Gressenheller University's Professor Hershel Layton is called to investigate the Wandering Castle, and find the people who have vanished.