The Nightjar [Hewitt, Deborah]

In this stunning contemporary fantasy debut about another London, a magical world hidden behind the bustling modern city. Alice Wyndham has been plagued by visions of birds her whole life...until the mysterious Crowley reveals that Alice is an aviarist capable of seeing nightjars, magical birds that guard human souls. But a faction intent on annihilating magic users will stop at nothing to destroy the new aviarist.