Having published her Encyclopedia of Faeries, Emily Wilde is deep in research for her next project - a Map of the Otherlands - but the scholarly peace of Cambridge is disrupted when Emily's fellow scholar and would-be-lover (and incidentally an exiled faerie king), Wendell Bambleby, is attacked by faeries sent by his step mother - having claimed his throne as her own isn't enough; she needs to destroy him. To save himself, Bambleby needs to confront his step-mother, but he can't do this without rediscovering the lost door back to his faery realm.
For Emily this is an opportunity to pursue two, or perhaps, three things at once - to find the door, to add to her knowledge of the Otherworld (particularly with reference to her map project), and, maybe along the way, find a long lost scholar believed to have disappeared into the faery realm many years before.
So, with Bambleby still suffering from the latest assault, they head off to the Austrian Alps, to encounter more hostile faery folk and put themselves in not a little danger.
I thoroughly enjoyed the first in this series of faery adventures, and its successor didn't disappoint. It isn't a dark academia style of story, full of brooding passion and handsome untrustworthy men/angels/demons but something far more cosy; a grown up fairy tale, or maybe an adult Alice in Wonderland. It isn't all sweetness and light though - danger seems to be stalking at every turn. In search of a cure for Bambleby's continuing illness, Emily must enter the Faery realm, facing down his step-mother in the heart of her own kingdom.
As a little piece of escapism from real world problems and the current freezing weather I'd highly recommend it.