A new Mare-Do-Well rises from the shadows, but who is under the mask? Just a lunatic running around in a costume? Or a truthful guardian angel protecting the innocent and punishing the guilty?
Shining Armour investigates the murder of a banker who's memory problems forces him to write every action he does in a diary. Despite this precious clue, Shining finds the case harder than expected.
Octavia and Vinyl find themselves travelling by airship to Trottingham, only to discover that the engineer has been murdered on board. With Vinyl the prime suspect, it's up to them to find the real killer before he strikes again.