When the smoke clears, a man lies dead and a young woman looks to blame.

The fire in the Ashmolean's archives reveals itself to be a cover-up for the real crime: dozens of valuables are missing from the shelves. Unfortunately, security guard Andrei Radu dies at the scene, elevating the crime to a homicide.

DCI Robinson, Oxford's leading detective, is determined to see the guilty prosecuted. The security feed puts Kate's young assistant Francie at the scene. She claims to be innocent but DCI Robinson isn't convinced.

Nat and her friends know the likely perpetrator is the person behind the problems with the magic. Can they save Francie from going down for a crime she didn't commit?