From the Hugo Award-winning author of The Rhesus Chart comes another
supernatural case from The Laundry Files...
Dominique O'Brien--her friends call her Mo--lives a curious double life
with her husband, Bob Howard. To the average civilian, they're boring
middle-aged civil servants. But within the labyrinthine secret circles
of Her Majesty's Government, they're operatives working for the nation's
occult security service known as the Laundry, charged with defending
Britain against dark supernatural forces threatening humanity.
Unfortunately, one of those supernatural threats has come between Mo and
Bob. An antique violin, an Erich Zahn original, made of white human
bone, was designed to produce music capable of slaughtering demons. Mo
is the custodian of this unholy instrument. It invades her dreams and
yearns for the blood of her colleagues--and her husband. And despite
Mo's proficiency as a world-class violinist, it cannot be controlled...