We’d been reluctant to employ a forensic psychologist because of the well-founded fear that they might section us for believing in fairies.
Turns out the dead girl has traces of magic about her: which might, thinks Peter, be another lead in his ongoing investigation of the Faceless Man. Working with DI Sahra Guleed, he uncovers some troubling connections that date back to the 'Tyburn Tree' executions of the seventeenth and eighteenth centuries, and to the lost ledger of 'Thief-Taker General' Jonathan Wild. Reynard the Fox pops up again: so does Lesley: there is more Nightingale. And there is progress, at last, on the mystery of the Faceless Man.
The Hanging Tree addresses the institutionalised sexism of British magic, and introduces more female characters. There's more sense of the wider world, too, with discussion of American practitioners and their views on European matters.
I'm not sure that reading four Aaronovitch novels back to back was the best way to appreciate them, but it distracted me from illness and kept me entertained and intrigued. And I'm looking forward to The Furthest Station, due in September ...