The son of an old friend, fearing that his father's life is in danger, asks the Chief to go to Tokyo. Once there Ironside finds his old friend wheelchair-bound as a result of an accident, and begins to work on his own theory about who might have hired a hitman to kill such a respected old man.

A man dies in what appears to be an accident, but his estranged daughter is convinced that the story is not nearly so simple. A complex Japanese puzzle appears to be the only clue to the truth and the Chief struggles to solve it alone. Meanwhile the daughter of the murdered man has problems of her own; but these can only be solved by Ed's special touch.