A new weekly thriller in seven parts by Edward J. Mason and Ted Willis.
Starring Glyn Houston, Betty McDowall, John Gabriel, Lloyd Lamble
with Christopher Beeny
A wreath with a letter attached to it by a piece of white telephone cord is the third clue to the two murders. Following a lead given to him by his son Ken, Det.-Insp. Mitchell's investigations take him to the Hot Piano Club owned by Alex Biggs.