Waiting on Wednesday: The Shadow Revolution
(Description nicked from Goodreads.)
“As fog descends, obscuring the gas lamps of Victorian London, werewolves prowl the shadows of back alleys. But they have infiltrated the inner circles of upper-crust society as well. Only a handful of specially gifted practitioners are equipped to battle the beasts. Among them are the roguish Simon Archer, who conceals his powers as a spell-casting scribe behind the smooth veneer of a dashing playboy; his layabout mentor, Nick Barker, who prefers a good pub to thrilling heroics; and the self-possessed alchemist Kate Anstruther, who is equally at home in a ballroom as she is on a battlefield.
After a lycanthrope targets Kate’s vulnerable younger sister, the three join forces with fierce Scottish monster-hunter Malcolm MacFarlane—but quickly discover they’re dealing with a threat far greater than anything they ever imagined.”