1. Missing on Voyage

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. 25 June 1973. 40 min

The case this week involves a creaking door, a murder and a phial of poison.

2. Knife in the Back

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. 2 July 1973. 40 min

This week's episode features a ghostly house on a remote Scottish island and a death amongst the week-end guests.

3. Crime After a Fashion

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. 9 July 1973. 40 min

This edition features the murder of a model during a fashion show.

4. Did He Fall or Was He Pushed?

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. 16 July 1973. 40 min

The managing director of a plastics firm if found dead at the foot of a three storey building.

5. Dead Likeness

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. 23 July 1973. 40 min

This week's case involves identical twins.

6. Happy New Year

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. 30 July 1973. 40 min

This episode features a murder that takes place just as the last few minutes of 1899 go by.