It's Gideon's borrowed-birthday but how can Hetty celebrate with her brother when girls are not even allowed to mix with the boys? With a plan to scale through the rafters and into the towers can the two wings secretly come together without Matron finding out, and not to mention the dangers of getting across the roof at night?

Mathias is back and a shadow of his former fearless self. With the Hospital on lock down in order to mass produce toys supposedly earmarked for charity, children start falling ill and Gideon tries to enlist Mathias' help to get to the bottom of Matron's toy making venture.