When their father accepts a new job in England, July, Liberty, and their family find themselves exploring the foggy streets of London. The twins try to discover the source of the voice only they can hear--a voice that needs their help. Using telepathy and their individual talents, the twins uncover a long-lost manuscript of Sir Arthur Conan Doyle’s, along with the ghost of Sherlock Holmes’s forgotten twin brother.
Original title: Double Trouble Squared
Genre: Fiction→ Children & Young Adult→ Mystery
Fiction→ Children & Young Adult→ Science Fiction→ Paranormal Powers