Lavie Tidhar 
Adler #5 [PDF ebook] 

Irene Adler and Jane Eyre are racing to the aerodrome to try to stop Ayesha, She Who Must Be Obeyed. An assassination attempt upon them at Lady Havisham’s failed, in no small part thanks to her arsenal of weaponry. Queen Victoria is still alive, kept so by some means of strange mechanical contraptions — and goodness knows what else. Her arrival facilitated Irene and Jane’s escape, and they are now charged with saving London and the Empire, but time is running out,