An elderly Sherlock Holmes is approached by his former partner Dr. John Watson for a baffling murder and kidnapping related to the one case the master detective never solved. When Wendy, John, and Michael Darling went missing from their nursery, Sherlock Holmes took the case, but before he could solve it they returned with 6 other boys and absurd stories of a far-off fantasy land.
But twenty years later, Wendy's husband has been murdered and her child has been abducted. She claims it's the work of Captain Hook, but Sherlock Holmes intends to uncover the true conspiracy. For once in his life, the impossible can't be eliminated.