Chris King 
Penny Dreadful (ongoing series) #9 [PDF ebook] 

Vanessa Ive’s body has been inhabited by the ultimate evil, Satan, as the hordes of hell rampage through the streets of London. Ethan, still grieving for the love of his life, has committed an act that will surely lead to the ultimate destruction of mankind… unless they can find the eternal flame, the only thing that can put an end to the horror that has befallen humanity.With so much at stake, and time of the essence, Catriona Hardtegan and Victor Frankenstein are charged with gathering their scattered troops, all the while battling demons and the Nephilim, in a desperate attempt to put on a show of force when they hunt down the immortal scourge of souls, and their last hope for redemption… the elusive Dracula.