Murdoch Mysteries: Nightmare on Queen Street S01E04 - Chapter Four: The Music of Madness

You've proven that James Danby and Doctor Bates were at the very least acquainted - they were members of the same Cricket club, although Doctor Bates appears to be ambivalent at best with regards to his deceased teammate. And Bates's Cricket bat is missing... You also now have the sales records of the local supplier who imported the metal fragment found embedded in the murder weapon, which will hopefully identify the purchaser. And Rebecca has become progressively more erratic, with increasingly common episodes of narcolepsy and sleepwalking, punctuated by fits of violence. Coupled with the cryptic messages she's left in blood, ink, and now this mysterious tune, you are confronted by more questions than answers, thus far...