'Monsters have been infesting London's dark places for centuries, eating every child who gets too close. That's why ten-year-old Birdie McAdam works for Alfred Bunce, the bogler. With her beautiful voice and dainty looks, Birdie is the bait that draws bogles from their lairs so that Alfred can kill them.
'One life-changing day, Alfred and Birdie are approached by two very different women. Sarah Pickles runs a local gang of pickpockets, three of whom have disappeared. Edith Eames is an educated lady who's studying the mythical beasts of English folklore. Both of them threaten the only life Birdie's ever known.
'But Birdie soon realises she needs Miss Eames's help to save her master, defeat Sarah Pickles, and vanquish an altogether nastier villain.' (From the publisher's website.)