The dual mystery hits hardest when you realize the game isn't the trap, it's the alibi. Conan chasing Sherlock through a Victorian murder while 49 kids' lives depend on him solving a completely different crime in the real world creates the kind of narrative pressure that makes every deduction feel like it matters twice. The Baker Street setting gives the whole thing an elegance most Conan films don't bother with, grounding the virtual stakes in something that feels actually historical.

Conan and dozens of other children are selected to test an experimental virtual reality system at an exclusive party. Their fun ends abruptly when a company employee turns up murdered, leaving a dying message that points to a clue hidden in the game's historical setting. With Ran and the Detective Boys, Conan logs in to crack the case, only for an artificial intelligence called Noah's Ark to lock them and the other young players inside. Aided by Sherlock Holmes, Conan must work through a simulated 19th-century London and hunt down Jack the Ripper, with the lives of the trapped children resting on his success.