Sherlock, Lupin, and me: The soprano's last song

Whisked out of Paris ahead of the Prussian army in 1870, twelve-year-old Irene Adler is reunited in London with her friends, Sherlock Holmes and Ars?ne Lupin--but Ars?ne's father has been arrested for murder and the kidnapping of a famous opera singer, and it is up to the three young detectives to solve the mystery.