Chris King 
Penny Dreadful (ongoing series) #5 [PDF ebook] 

An ill wind blows through the streets of London…The worst has come to pass. Lucifer has risen and Sir Malcolm is dead. As the ultimate Evil gathers his troops, Catriona Hartdegen, the only one left to fight, takes on the forces of darkness surrounding her, with nothing but righteous fury in her heart.With the Master of Hell abroad once more, no one is safe, as Dorian Grey will learn. His past has caught up with him and he is about to find whatever loyalty he possesses will be sorely tested. Ethan, the Wolf of God, is also confronted with his fast-approaching destiny, but first he must come face to face with the woman he once knew and loved…