What Abigail Did That Summer

While her cousin - police constable and apprentice wizard Peter Grant - is off in the sticks chasing unicorns, Abigail Kamara is chasing her own summer mystery. Teenagers around Hampstead Heath have been going missing but soon return home - unharmed but vague about where they've been. Aided only by her new friend Simon, her knowledge that magic is real, and a posse of talking foxes that think they're spies, Abigail must venture into the wilds of Hampstead to discover who is luring the teenagers and more importantly - why ?