A new matron arrives, the terrifying and puritanical Miss Fox. Even Loftus, who knew her when he was a young doctor, is scared of her. Duncan and Paul attempt to get rid of her by sending love letters supposedly by Bingham but all in vain. Duncan and Bingham fall out over the same girl, Sandra, and Duncan decides to get at Bingham by putting a bucket of whitewash on top of the door so that it will fall him. It claims another victim instead - but it gets rid of the Fox!

Bingham and Mary are getting married but Mary is applying for promotion and Lawrence fears she won't get it if it's known she's married, so Duncan tells him to keep the wedding secret and leave it to the last moment. The day arrives and Duncan, who is to be best man, and Lawrence, race through an operation, arousing the suspicions of Paul and Dick, who think Mary is marrying Duncan. The wedding goes ahead but the four doctors get into a scrap and fall into a fountain, which shows up on the wedding photos.