Rivers of London: Night Witch Series by Ben Aaronovitch, Andrew Cartmel

Following a disastrous attempt to 'recruit' the witch, Vavara, a Russian oligarch turns his sights on Peter Grant and Thomas Nightingale – two of London's finest policemen and its only wizards – to help recover his daughter – apparently kidnapped by dark elemental forces. But for Peter and Nightingale, a dark betrayal from the past is about rear its ugly head...

Desperate to find his missing daughter, Russian oligarch Nestor Yakunin has resorted to extreme methods – he has kidnapped innocent civilians to force Peter Grant and Thomas Nightingale – London's elite wizarding policemen – to help in the search. But you play with magic, you're going to get burnt...

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!

RUSSIAN TO DISASTERThe daughter of a powerful Russian oligarch has vanished from her home, apparently taken by a mythical forest creature fresh out of Russian legend. To 'encourage' Peter's cooperation in finding the missing child, his boss Nightingale is kidnapped--and Peter finds himself caught in a tangled web of intrigue where nothing is as it seems! Collects Rivers of London: Night Witch #1-5