This is really good fun. There's a dramatic and humorous story of a woman trying to get her bearings in a supernatural government agency, after a complete memory and personality wipe. This is interspersed with infodump letters from her former self, and an urgently progressing spy narrative. The book worked for me on almost every level, with my one critique being some of the nuances in the portrayal of interrogation as a government technique. However, I find it hard to mark the text down for anything because it's a rollicking, Bechdel test smashing, good time, and I had too much fun to grump.