Pack Animals is a BBC Books

BBC Books

BBC Books is an imprint majority owned and managed by Random House. The minority shareholder is BBC Worldwide, the commercial subsidiary of the British Broadcasting Corporation...

 original novel written by Peter Anghelides

Peter Anghelides

Peter Anghelides is an English author and dramatist best known for his work on various spin-offs related to the BBC television series Doctor Who.-Work:...

 and based on the 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...

, 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...

spin-off

Spin-off (media)

In media, a spin-off is a radio program, television program, video game, or any narrative work, derived from one or more already existing works, that focuses, in particular, in more detail on one aspect of that original work...

 series Torchwood

Torchwood

Torchwood is a British science fiction television programme created by Russell T Davies. The series is a spin-off from Davies's 2005 revival of the long-running science fiction programme Doctor Who. The show has shifted its broadcast channel each series to reflect its growing audience, moving from...

. It features all the regular cast of the show and is set during the second series.

Plot summary

Gwen witnesses a Weevil

Weevil (Torchwood)

Weevils are a fictional extraterrestrial species from the British science fiction television series Torchwood, first appearing in the episode "Everything Changes". As Jack Harkness explains in that episode, the name "Weevil" is applied to them by Torchwood, but as communication with them is...

 attack at a shopping centre, Ianto is injured by alien tech at the zoo and aliens are invading on Halloween

Halloween

Hallowe'en , also known as Halloween or All Hallows' Eve, is a yearly holiday observed around the world on October 31, the night before All Saints' Day...

. Torchwood may be able to control small alien threats, but someone is allowing a large pack of predators to hunt on Earth...