When the cadets discover that Goldfist has his eye on a warship, they fear the worst.

Spy School's arch nemesis Goldfist has found himself a new financial backer. Goldfist would be unstoppable with unlimited funds, so it is down to the Spy School cadets to identify Goldfist's new partner in crime and stop his payments before it's too late!

When art critic Leonardo De Grouchy writes a scathing review about Goldfist's paintings, the evil villain promises to exact his revenge upon the critic. The Tate Britain Art Gallery becomes the scene of an awful crime, but will the Spy School cadets be able to save Leonardo De Grouchy?