A woman with wings that exist in another dimension. A man trapped in his own body by a killer. A briefcase that is a door to hell. A conspiracy that reaches beyond our world. Breathtaking SF from a Clarke Award-winning author.<br><br>Tricia Sullivan has written an extraordinary, genre defining novel that begins with the mystery of a woman who barely knows herself and ends with a discovery that transcends space and time. On the way we follow our heroine as she attempts to track down a killer in the body of another man, and the man who has been taken over, his will trapped inside the mind of the being that has taken him over. <br><br>And at the centre of it all a briefcase that contains countless possible realities.<br><br>Tricia Sullivan returns to the genre with a book that will define the conversation within the genre and will show what it is capable of for years to come. This is the best book yet from a writer of exceedingly rare talent who is much loved in the genre world.