Co-written by New York Times bestselling author, James Swallow! A dangerous monster is at large above the streets of London. And its name is... Wyvern!After a Met Police helicopter on night patrol is attacked by an unidentified aerial phenomena, the Met's only sanctioned wizard, Peter Grant, and his mentor, Thomas Nightingale, are called to investigate.Peter and Nightingale find themselves drawn into a battle between two groups of hunters – one human, and one fae – as they uncover a legacy of events that extend back to the 1960s. To save the skies of the city, Peter must face the enraged beast – but can he end things peacefully... or will he be forced to destroy the last wyvern?