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In "A Fairy in the Flat" - Mr. Carter, Tommy's boss, asks Tommy and Tuppence to take over a detective agency. What type of stamp does he ask them to look out for?

Russian. Tuppence is bored with life. Mr. Carter explains that Theodore Blunt, the original owner of the detective agency, is in prison. He did foreign business so Tommy and Tuppence are to be on the look out for blue letters with a Russian stamp. Under the stamp will be a number sixteen.

In "A Pot of Tea" - Where is the detective agency based?

Bloomsbury. Tommy and Tuppence take over the detective agency. It is called Blunt's Brilliant Detectives. They refuse to deal with divorce cases. Their fist customer is a rich young man who is concerned about the disappearance of the girl he loves. Tuppence rashly says they will find her in 24 hours. But all is not what it seems. Tommy is Mr. Blunt, while Tuppence is his secretary Miss Robinson. Albert is now their office boy.

In "The Affair of the Pink Pearl" - in which room was the pearl found?

Bathroom. Tommy and Tuppence investigate the disappearance of an expensive pearl at a house party. Unfortunately one of the members of the party is a kleptomaniac. The pearl is hidden in a bar of soap. Tommy and Tuppence take on the roles of fictional detectives when they investigate crimes. This is a Dr. Thorndyke case, created by R. Austin Freeman. We are also introduced to Inspector Marriot of Scotland Yard.

In "The Adventure of the Sinister Stranger" - what did Tuppence buy as a wedding present for a male friend?

Cigarette case. This case begins when the detective agency receives a blue letter with a Russian stamp. This is a Brothers Okewood mystery, created by Valentine Williams.

In "Finessing the King" and "The Gentleman Dressed in Newspaper" (a story in two parts) - in which newspaper do Tommy and Tuppence see an advertisement in the personal column about finessing the king?

The Daily Leader. "Finessing the King" concerns a nightclub called The Ace of Spades, and the fancy dress ball there at midnight. During the ball, which Tommy and Tuppence attend, a woman is stabbed to death. This is a McCarty and Riordan mystery, created by Isabel Ostrander.

In "The case of the Missing Lady", where is The Grange nursing home?

Sussex. An artic explorer returns home from an expedition to find his girlfriend has disappeared. This is a Sherlock Holmes case, created by Sir Arthur Conan Doyle.

In "Blind man's Bluff", where were Tommy and Tuppence dining when they meet the mysterious "Duke of Blairgowie"?

The Blitz. Tommy is kidnapped while playing the part of Thornley Colton, the blind problemist. Clinton Holland Stagg created Colton.

In "The Man in the Mist", what was the name of the avenue where Glinda Glen was staying?

Morgan's. Glinda Glen, the famous actress, is introduced to the detective when Tommy is playing the role of Father Brown. Glinda is later found dead, in a house on the avenue where it is believed a ghost of a policeman haunts. G. K. Chesterton created Father Brown.

In "The Sunningdale Mystery", what was Captain Sessle stabbed with?

Hat pin. This case involves the murder of a golfer, found dead on a golf course. He was saw talking to a blonde woman before he died. This is an "Old Man in the Corner" case, created by Baroness Emma Orczy.

In "The Crackler", which famous fairy story is the story loosely based on?

The Tinder Box. The case involves forged bank notes. This is an Edgar Wallace type mystery, Wallace wrote many books.

In "The House of the Lurking Death", what poison was in the box of chocolates?

Arsenic. A young lady comes to the agency; she thinks someone is poisoning her. When she later dies, Tommy and Tuppence investigate it. This is a Hanaud case, created by Alfred Edward Woodley Mason.

In "The Unbreakable Alibi", what nationality was Una Drake?

Australian. A woman challenges her boyfriend that she can be in two places at once, and she also has witnesses to say so too. Tommy and Tuppence investigate how this can be done. This is an Inspector French case, created by Freeman Willis Croft.

In "The Clergyman's Daughter" and "The Red House" (another story in two parts) what season is the story set in?

Winter. In fact it is Christmas Day at the end of the story. Monica Deane comes to the detectives. She is trying to sell her house, but it seems to be haunted. This is a Roger Sherringham case, created by Anthony Berkley Cox.

In "The Ambassador's Boots", which ship did the American ambassador travel on?

Nomadic. The other ships also appear in other Agatha Christie novels. (Lusitania was in "The Secret Adversary". Kilmorden Castle was in "The Man in the Brown Suit" and "Death on the Nile" featured the Karnak.). This concerns the disappearance of the Ambassador's boots. This is a Doctor Fortune and Superintendent Bell case created by H. C. Bailey.

And finally in "The Man who was Number Sixteen", this is based on a Hercule Poirot novel. But which one is it?

The Big Four. Agatha Christie of course created Hercule Poirot as well as many other detectives. This case concerns the blue letters, which began Blunt's Brilliant Detectives. At the end of the story, Tuppence is expecting her first child. Look out for more Christie quizzes soon!