Whispers Under Ground

Whispers Under Ground is by Ben Aaronovitch. The third book in the fantasy Rivers of London series. When a dead body is found in the underground station at Baker Street, stabbed with a piece of pottery which has a magical aura, Constable Peter Grant is called in to solve the case. To do so, he must head into the haunted depths of the largest subway system in the world. Fans of the series will love this installment. 

Ratings: 11th grade - 8 out of 10 - P (profanity) - AC (mature thematic content).