Those Who Hunt the Night by Barbara Hambly
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Taking us to the cobbled streets of Edwardian London, "Those Who Hunt the Night" introduces us to former spy James Asher and his scholar wife, Lydia. When vampires in London start getting murdered (yes, you read that right), Asher finds himself reluctantly dragged into the underworld of the undead to solve the mystery.
Hambly skilfully weaves historical fiction with dark fantasy, creating an atmospheric tale where gas lamps illuminate characters as complex as the plots they navigate. This book is less about fangs and more about the uneasy alliance between humans and vampires, each with their own codes of ethics and murky moralities.