A young clerk in a gloomy North Country undertaker's office, Billy's humdrum job, wild imagination and unhappy family life, leads him on frequent flights to "Ambrosia," a mythical kingdom where he is crowned king, general, lover or any idealized hero the real situation of the moment makes him desire. His vacillating commitment and immaturity have created situations which make Ambrosia all the more attractive.
He's succeeded in becoming engaged to two different girls simultaneously, while in love with a third, Liz. He's in hot water with his employer, having spent a rather large sum of postage money on his personal frivolities. And last, but not least, his dream of becoming a highly-paid, famous scriptwriter in London seems doomed to failure. The only person in his life capable of bringing him down to earth is Liz, and she's having a difficult time of it.
Finally, he gets his life sufficiently in order to leave for London with his true love. Billy still hasn't come to grips with the real world by the end of the film. He leaves the train to buy milk from a vending machine and watches the train slowly pull out for London with Liz aboard. He returns to the more comfortable shelter of his parents home, Ambrosia and his imagination.
The highlight of the evening, undoubtedly, was finding a pair of RayBan sunglasses down the side of my seat as I got up to leave. Thank god that HMS Director didn’t see me put them in my pocket or I’d be in detention from now until Michelmas.