In the Bleak Midwinter

Take four men, a green dog, an impossible espionage task, mix together and drop into an alternative World War I snowstorm. The narrator has to juggle three different identities and has to keep track of which of his alter egos speak which languages. They all ought to be killed at any moment, and any other moment, but they still occasionally find time to feast. There are bats everywhere in midwinter...