Moon Over Soho by Ben Aaronovitch

In this thrilling urban fantasy, Peter Grant, a detective constable and apprentice wizard, finds himself embroiled in a mysterious case involving the magical underbelly of London. As he investigates the suspicious deaths of jazz musicians, Peter uncovers a world where music holds a dangerous power and ancient forces lurk in the shadows. With his mentor Nightingale and a cast of eccentric characters, Peter navigates the complexities of magic, crime, and his own growing abilities, all while trying to keep the city safe from supernatural threats.

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