The Coldest War (novel)

Publisher's summary
The TARDIS loses power mid-flight and crash lands in a deserted snowy landscape. The Doctor you 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.