Classic Ealing comedy starring Alec Guinness. Captain Ambrose (Guinness) has a problem - a serious problem. Despite being descended from a famous seafaring family, he struggles on board ship because of chronic seasickness. At the end of the war, he decides to quit the waves and take a shore command. Buying the amusement arcade on the pier at Sandcastle-On-Sea, he looks for a calm life. But even on shore, he finds the waters rough. Opposition comes in the form of the local town council, which decides that all forms of gambling should be banned. From then on, Captain Ambrose faces stormy seas and all is definitely not plain sailing.