Mycroft has sent Sherlock to Oxford to catch up on his studies. Once there, he's again distracted when he hears stories about stolen body parts, which are being sent to an address in Wales. His curiosity aroused by the tales, Sherlock decides to discover who is behind the theft and why. Arriving at the lonely manor house in Wales, Sherlock hears a tale of a house rumored to be a hiding place for fleeing Royalists and royal treasure, but now, while its owner is asleep, the house moves from its foundation to the nearby apple orchard then returns by morning.