Ben Aaronovitch & Andrew Cartmel 
Rivers of London: Night Witch #2.5 [EPUB ebook] 
Night Witch #5

Press-ganged into helping a Russian oligarch hunt his missing daughter, PC Peter Grant and his boss, Thomas Nightingale, London”s only wizarding cops, find themselves caught up in a battle between Russian gunmen, a monstrous forest creature – and their nemesis: The Faceless Man. But as Grant and Nightingale close in on the missing girl, they discover that nothing about this case is what it seems!