Murdoch Mysteries: Nightmare on Queen Street S01E03 - Chapter Three: Ciphers and Somnology

Over the past week, you've learned that Rebecca's parents are dead, her mother, a singular woman of many talents, in a tragic accident a year ago, and her father several years ago - murdered whilst asleep in his bed. Is this a coincidence? Mary's death seems to be worth another look. Doctor Luther Bates, whose care Rebecca was under previously, is an odious man who has subjected her to all manner of barbarisms, according to Doctor Ogden. Finally, you have managed to decode four out of the five symbols that Miss Foster delivered so disturbingly: Doctor, Stop, Danger, and Afraid. The final symbol still eludes you, though it does look familiar...