Originally Aired: May 28, 1957

In A Case For Doctor Morelle #6, "Voice In The Night," an elderly woman named Miss Nicholson arrives at Dr. Morelle's office with a disturbing tale. For the past week, she has been receiving mysterious midnight phone calls from a man warning her that someone is after her money and plans to murder her. Despite reporting the threats to the police, they dismiss her concerns as the worries of a nervous spinster. Living alone in a small Chelsea house with only her elderly dog Billy for company, Miss Nicholson turns to Dr. Morelle for help based on a friend's recommendation. She insists she has no money worth stealing, yet the anonymous caller seems convinced otherwise.

After listening to her story, Dr. Morelle agrees to investigate and reassures Miss Nicholson that the threats may not be serious, since warning a victim seems counterproductive for a genuine criminal. However, when Miss Nicholson accidentally leaves her shabby handbag behind, Miss Frayle discovers it is stuffed with five pound notes, possibly thousands of pounds worth. When Miss Frayle rushes after her to return it, Miss Nicholson has mysteriously vanished from Harley Street without a trace.