While on summer vacation at the seaside, twelve-year-old Irene Adler meets the young Sherlock Holmes, and his friend Arsène Lupin--and when a dead body floats ashore the three young friends set out to solve the mystery.

Receiving a warning that her mother is in danger from a woman who promptly vanishes, Irene, Sherlock, and Lupin follow clues to a secret crypt beneath the streets of Paris, where they discover a priceless relic.

"Beloved adventuress Irene Adler teams up with her former adversary in a near-deadly inquiry into a room full of eerily stopped grandfather clocks. Learn of the case that cemented the lasting friendship between Holmes and Inspector Lestrade, and of the tragic crime which haunted the Yarder into joining the police force. And witness Stanley Hopkins's first meeting with the remote logician he idolizes, who will one day become his devoted mentor. From...