With the fairies in Dublin

Fifteen-year-old Elia Evander finds herself in the middle of her first mission as a Magent. A magical artefact has been stolen in Dublin! Since then, more and more mythical creatures have been appearing in the city, endangering not only themselves, but also humans. However, getting the stray creatures back into their world unnoticed is not easy at all. Why are these creatures suddenly so aggressive? And how is Elia supposed to find something when she doesn't even know what it looks like?