Foxglove Summer, by Ben Aaronovitch

Constable Peter Grant has been sent out of London to the Welsh border, ostensibly to follow up a magical lead but also for a change of scene, following the devastating betrayal by colleague Lesley May. But the countryside turns out to be not so peaceful as two young girls have gone missing and Peter stays to lend a hand. He soon discovers a magical element to the disappearance and is seconded to the taskforce searching for them. He has the assistance and consolation of river goddess Beverley Brook, as well as local copper Dominic Croft. In amongst dealing with the Fae, changelings and aggressive invisible unicorns, Peter has to deal with texts from Lesley, treading a fine line between the personal and professional. The danger is in the woods at night. Will this city boy be able to navigate the tricky trees and make it back to London? It’s good to see Peter’ character develop as this series continues. He is growing up and showing just why he is a cop – and a trainee wizard.