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

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

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

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

This week's case involves identical twins.

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

Jon Pertwee takes over as the host, and there's a murder on set.

In this episode a murder takes place on the night train to Yorkshire.

A retired General is murdered after completing his memoirs, and then the final chapter disappears.

During World War I, an unpopular Sargeant is shot, but who killed him?

This edition features the theft of a famous painting.

There is a murder at a fancy dress party.

A man who recently inherited a fortune drops dead in the middle of his speech after the annual family dinner on Christmas Eve. There are six suspects - but which has the strongest motive? The sleuths are Wendy Craig, Leslie Crowther, Patrick Mower and Derek Nimmo.

Actor Norman Bowler and novelist Jackie Collins join regulars Anouska Hempel and Patrick Mower to follow another sprinkling of clues. As always, there are more than a few red herrings.

Many crimes are solved by pure deduction - or a process of elimination. Aimi MacDonald and Alfred Marks are the guest stars pitting their wits against the audience to solve another murder mystery.

A row is brewing within a famous pop group the Weasels. But before the showdown ensues, one of the group is murdered on stage. Guest stars are Paula Wilcox and Richard O'Sullivan.

A murder is committed in a research lab and the only clues are a ring and a matchbox. Scientist Magnus Pyke and actress Polly James put their heads together to try and solve another mystery in which nothing is quite as it might at first seem.

How did a suitcase of clothes become a suitcase of rubies?

The chairman of the board has been murdered. Whodunnit? And how?

The chilling tale of the frozen chef. Who froze him and why? The CIA, MI5 and French security services are the principal ingredients in this mixture of freshly cooked spies. Getting their teeth into the clues are Rodney Bewes and Julie Edge.

Terry Scott and Dilys Laye join the panel to puzzle out a cleverly planned shooting. The gun is found but all is not as it appears - and the main red herring could be a dead rat.

Another mystery to test the sleuthing talents of viewers and panelists including guests Honor Blackman and Leslie Crowther. This time it's a murder at 30,000 feet over France.

The managing director is dead but how did his body get across a freshly painted floor? Guests include Rosemary Leech and Jimmy Jewel.

A police informant is found with a knife in his back.

A crime, with a scientific twist, set in the future.

A woman is murdered in a beauty parlour.

An unsuspecting victim succumbs to death by poisoning.

A monastery is the target of a thief.

A man is killed at a tanning booth.

The career of a football manager is cut short.

It's 1925, and a daring thief makes off with a precious gemstone.

Rehearsals for a murder mystery play turn sinister when one of the actors is poisoned for real.

Seventieth birthday celebrations for a bad-tempered Chairman of the Board end with a bang!

A top British scientist is gunned down as he works in his laboratory.

It's the finals of the Banworth Chemical Works dance competition and there's murder on the dancefloor.

An apparent suicide is not all that it seems...

There's dirty work at an inn on the Cornish coast.

Priceless diamonds vanish from the safe at a police station.

A murder takes place at the climax of a thrilling illusionist act.

A fortune teller is murdered but the solution is hardly crystal clear.

A casino director's number has at last come up.

Wages are stolen from a safe -- next to which is lying a dead body!

The panel grapples with a case involving all the fun of the circus.

Who has poisoned the ruler of an oil-rich Arab country?

Murder strikes at a "school for lovers."

Murder in a photographic studio keeps the panelists guessing.

What killed Philip Cunning ham -- the cigar, the Scotch, or the cup of tea?