Tragedy Day is an original novel written by Gareth Roberts

Gareth Roberts (writer)

Gareth John Pritchard Roberts is a British television screenwriter and novelist, best known for his work related to the science-fiction television series Doctor Who...

 and based on the long-running British

United Kingdom

The United Kingdom of Great Britain and Northern IrelandIn the United Kingdom and Dependencies, other languages have been officially recognised as legitimate autochthonous languages under the European Charter for Regional or Minority Languages...

 science fiction television

Science fiction on television

Science fiction first appeared on a television program during the Golden Age of Science Fiction. Special effects and other production techniques allow creators to present a living visual image of an imaginary world not limited by the constraints of reality; this makes television an excellent medium...

 series Doctor Who

Doctor Who

Doctor Who is a British science fiction television programme produced by the BBC. The programme depicts the adventures of a time-travelling humanoid alien known as the Doctor who explores the universe in a sentient time machine called the TARDIS that flies through time and space, whose exterior...

. It features the Seventh Doctor

Seventh Doctor

The Seventh Doctor is the seventh incarnation of the protagonist of the long-running BBC television science-fiction series Doctor Who. He was portrayed by the actor Sylvester McCoy....

, Ace

Ace (Doctor Who)

Dorothy Gale McShane, better known by her nickname Ace, is a fictional character played by Sophie Aldred in the long-running British science fiction television series Doctor Who...

 and Bernice

Bernice Summerfield

Bernice Surprise Summerfield is a fictional character created by author Paul Cornell as a new companion of the Seventh Doctor in Virgin Publishing's range of original full-length Doctor Who novels, the New Adventures...

. A prelude to the novel, also penned by Roberts, appeared in Doctor Who Magazine

Doctor Who Magazine

Doctor Who Magazine is a magazine devoted to the long-running British science fiction television series Doctor Who...

#210.

Synopsis

Empire City on the planet Olleril is experiencing 'Tragedy Day', where the well-off give charitably to the poor. However, this specific day has much more to offer, with murders, weaponry and plots that could destroy everything.

The trio, naturally, all want to leave but had been captured by various factions within minutes of arrival.