1. The first clue that this was going to be a different sort of episode was when a character said "Why didn't they ask..", then noticed someone had come into the room and exclaimed "Heavens!" Which character thus subtly mentioned Agatha Christie's 'Why Didn't They Ask Evans?'? Miss Chandrakala Professor Peach Robina Redmond Roger Curbishley

2. Lady Clemency Eddison mentioned to Agatha Christie that she had read all six of her books. What book could Lady Eddison not have read? The Secret of Chimneys The Secret Adversary The Labours of Hercules The Man in the Brown Suit

3. When Donna and the Doctor see where the first victim was murdered, what title of an Agatha Christie book did Donna exclaim? Murder at the Vicarage Murder on the Links The Body in the Library The Sittaford Mystery

4. Donna goes on to speak about the first murder with the character's name, the location and the weapon. What board game was this a reference to? Answer: (One Word.)

5. Donna, still marvelling at how much this day is resembling an Agatha Christie book, then says that they'd be saying next that it was an Agatha Christie title "and they all did it". What Agatha Christie book did this refer to? Ten Little Indians Third Girl Five Little Pigs Murder on the Orient Express

6. The next reference to an Agatha Christie title comes from Agatha herself. On commenting that nobody has an alibi for the first murder, she says that who "remains hidden"? The Secret Adversary Five Little Pigs The Man in the Brown Suit The Mysterious Mr Quin

7. The Doctor saw Agatha find a piece of paper. When they examine it together, it turns out to be charred, with just a single word remaining. The Doctor asks what the first letter is and gives which two choices? A or B N or M X or Y P or Q

8. Still musing on their lack of knowledge about the murderer, who does Agatha say remains at large? "Our _______" Partners in Crime Nemesis Dumb Witness Curtain

9. The action then shifts to the kitchen, where the cook, Mrs Hart, says that murder will put the which Agatha Christie mystery title "and no mistake"? Ordeal by Innocence A Caribbean Mystery Postern of Fate Cat Among the Pigeons

10. The butler, Davenport, was musing on the death of the first character and wanted to know why he'd always been asking questions for his book. What Agatha Christie title did Miss Chandrakala, Lady Eddison's maid, dismiss the book as and nothing more? Halloween Party Hickory Dickory Dock Dead Man's Folly 4.50 from Paddington

11. Chasing after the giant Wasp, Donna is pleased that this time, they're chasing the monster. Agatha Christie disagrees with the 'monster' tag, saying that "It's a trick" - followed by which book title? After the Funeral They Do it with Mirrors Elephants can Remember By the Pricking of My Thumbs

12. Lady Eddison is sobbing over the death of Miss Chandrakala, when she finds out that Miss Chandrakala had been looking for her. She explains that she hadn't found her and that Miss Chandrakala had a/an what instead? Three Act Tragedy Appointment with Death Murder in the Mews Evil Under the Sun

13. By this time Lady Eddison's husband, Colonel Hugh Curbishley, is getting impatient with Agatha Christie and barks at her "For Heaven's sake!" Followed by what expression? Dumb Witness Murder is Easy Cards on theTable Mrs McGinty's Dead

14. Suddenly, the Doctor is poisoned in his fizzy drink! (Probably a lime soda, as that's what he asked for when he arrived.) Agatha Christie smells bitter almonds in the drink, which enables her to describe the poison as...? Sparkling Cyanide Fizzy Phosgene Animated Arsenic Bubbly Benzocaine

15. So, to the classic Christie-style denoument. Conducted by the Doctor in traditional, leaning on the fireplace, way, he starts by expaining that he has called them all there on this what night? Gaudy Endless Dark and stormy Saturday