Blood Red, Snow White - Marcus Sedgwick

I loved the fairy tale aspect of the opening chapters. It was a useful framing device for introducing the characters, sketching out the history and evoking the mood of the Russian revolution. I was intrigued by the spy-history plot in the second half but wanted the pacing to move a bit faster. I'm unfamiliar with the war but it made me curious to look into it more - especially the historical spy background of the character Arthur Ransome.