Henry Simon as the host. This 1970 South African series presents stories from the files of The South African Missing Persons Bureau. The programs are dramatized by Ross Napier. The series was sponsored by Colgate.

The most entertaining Thriller programs are based on real life. Address Unknown was based on stories from the Missing Persons Bureau files in London. A real missing person is at the core of every episode.

Although the cases are well beyond cold by now, Address Unknown is sure to delight mystery and Whodunit fans everywhere.