While Richard is hired to find out who sent a threatening letter to a stage actress, his old mentor pays him a visit and becomes involved when the actress is poisoned during a rehearsal.

The impaled man in a mask turns out to be Tokio Ebara, a computer hacker. There are several suspects related to Tokio, with a lack of solid alibis. The Night Baron appears once again and Ran engages him in karate, but he manages to foil her kick! Conan finds a clue that leads him towards solving the case.