Following the death of her parents, the sixteen-year-old Portia Quayne comes to live with her older half-brother Thomas and his wife Anna. Although they are brother and sister, Thomas and Portia have had very different lives. He, in his late thirties, is a wealthy advertising executive, who has also inherited money from his mother and lives in one of the elegant Regency terraces surrounding Regent's Park. She is the family's guilty secret, the daughter of Thomas's father by his second wife. The elder Mr Quayne, a seemingly respectable middle-aged businessman, was divorced by his first wife after getting his mistress, Portia's mother, pregnant. As a result he was banished from polite society in England, and Portia has spent her entire childhood living in various seedy hotels on the Continent.
The book is divided into three sections, entitled "The World", "The Flesh" and "The Devil". The first and last sections are set in London, the middle one in the Kentish seaside town of Seale-on-Sea, where Portia goes to stay with Anna's old governess, Mrs Heccomb, while Thomas and Anna are abroad. (Seale, a fictitious town probably based on Hythe near Folkestone, also features in a later Elizabeth Bowen novel, "The Heat of the Day").
Portia is a quiet, naive and unworldly girl, who finds it difficult to fit into the fashionable world of her brother and sister-in-law. Thomas is a rather dull individual whose main preoccupation is making money, Anna a glamorous and sophisticated, if cold and conventional, society hostess, with a number of suspiciously close male friends,. Neither of them welcome having Portia staying with them, and take her in reluctantly out of a sense of duty. Anna in particular resents Portia, whose innocence is at odds with her own worldliness. Portia also seems out of place in Seale; although Mrs Heccomb treats her kindly, she cannot fit in with Mrs Heccomb's children Dickie and Daphne and their "fast" set of fun-loving friends.
Portia has fallen in love with Eddie, a rather useless young man who is one of Anna's protégés (and possibly one of her former lovers, although Bowen is never explicit on this point). After being sent down from Oxford, Eddie has tried becoming a writer, abandoning that career after his first, satirical, novel upset too many people, and currently works in Thomas's agency, where Anna has found him a position, despite his having neither a liking nor an aptitude for the advertising business. The bored, cynical Eddie and the innocent young Portia are, of course, quite unsuited to one another, but she is too besotted with Eddie to notice his bad points. Only when she invites him to Seale for the weekend and he spends most of his time flirting with Daphne Heccomb does she realise that he might not be the man of her dreams. Portia has been confiding her intimate thoughts to her diary; when she discovers that Anna has been invading her privacy by reading this, she takes a drastic step.
Elizabeth Bowen demonstrates in this book her gift for descriptive writing; I was particularly struck by the opening chapter, in which she conjures up a vision of Regent's Park on a frosty January evening. Her main concerns, however, were characterisation and in social and psychological analysis. This is not a book which will appeal to those who like their fiction be packed with physical action; the most interesting action is that which takes place in the minds of her characters, especially Portia. The "death" of the title is a metaphorical one, as Portia's innocent idealism is shattered by the cynicism and heartlessness of Anna, Eddie and their set. "The Death of the Heart" is a sensitive, finely-written novel which justifies its owner's reputation as one of the leading British novelists of the twentieth century.