The Coldest War (novel)

Publisher's summary
The TARDIS loses power mid-flight and crash lands in a deserted snowy landscape. The Doctor and Amy discover something is sucking the energy from anything passing through the atmosphere above... but is it the Sycorax, or something else entirely?

Characters

 * Eleventh Doctor
 * Amy Pond

Continuity

 * This novel features the return of the Sycorax who first appeared in DW: The Christmas Invasion.
 * In one version of the story a shapeshifter changes into two other aliens the Doctor has encountered: a Judoon and a Draconian.