In the aftermath of the events seen in
Ghosts of Karnak
, and with the political climate somewhat eased, Gabriel takes Ginny to London by airship to recuperate. But he isn’t counting on coming face-to-face with a man who claims to embody the spirit of Albion itself, sinister forces gathering in the London Underground and an old ally – the British spy, Peter Rutherford – who could desperately use his help.