What Abigail Did That Summer, by Ben Aaronovitch

Magic is real, but not that many people know about it. Abigail Kamara, age 13, is one of the few. When teens start going missing around Hampstead Heath, Abigail is certain a magical element is involved. She enlists her new friend Simon and a team of foxes to investigate. The teen’s usual ally, her magical cop cousin, is busy up north and Abigail is afraid his boss will stop her getting involved. It’s a tricky case, but fortunately Simon’s mum has a few useful contacts. Abigail is a smart, strong and streetwise heroine with a wealth of resources. The text has a wry wit with appeal across a wide age range. This is a spin off tale from a series, Rivers of London, but it holds up pretty well as a stand-alone story for the uninitiated.