Reggie Grace is a hapless, clumsy medical student but Collier has given him a good report because he fancies his sister, so when a party of big-wigs come to visit the hospital Grace is charged with showing them round. To cause a diversion Collier feigns illness and collapses. The plan is that he supposedly has glandular fever but Reggie correctly diagnoses a slipped disc and is declared the hero of the hour by the visitors.

Due to a remark made by Duncan in his local Chinese restaurant, a party of Chinese communists comes to visit the hospital. Bingham, in particular, is convinced they are spies come to find how hospital equipment can be used to start wars, so there is panic when they all go missing. In fact they have been admiring the hospital's linear accelerator and put in an order for some for Chinese hospitals. They are then invited to watch an operation, which the paranoid Bingham almost sabotages, but the day ends well. However, it seems that Duncan has also been shooting his mouth off in his local Hungarian restaurant as well.