Warning: Wikipedia contains spoilers.
The plantiff is a doctor impressed into the service of the Nazis after Poland was overrun in World War II. As head physician in a concentration camp he has the opportunity to save many Jews and other prisoners from the gas chambers. After the war, he becomes a naturalized citizen of Great Britain and serves for several years in a free medical clinic in Borneo. Upon resuming private practice, the doctor is confronted with allegations that he collaborated with the Nazis and performed ghastly medical experiments for them. At first he is staunchly defended, but as more evidence comes to light in the trial, his past is revealed.
The defendant served overseas in World War II and recovered in England. He'd been a reporter and a writer of screenplays before and after the war, and one of his books documents the experiences of concentration camp survivors, several of whom cite the plantiff as the source of their suffering. When he publishes a line to this effect in his latest book, citing "thousands of persons" as opposed to "dozens", he and the publishing house are sued for libel.
Part three of the novel is set in one of Her Majesty's courtrooms (Queen's Bench, Courtroom Seven of the title) where this trial is played out. The jury finds for the plantiff and awards him one halfpenny in damages -- the lowest amount that can be awarded for damages in Britain. In effect, the whole novel seems to indict the plantiff for collaborating, while the defendant who is guilty of exaggeration has his literary reputation ruined. As the defendant says before the verdict is read, "Nobody's going to win this trial; we're all losers." And the novel ends with the start of the Six-Day War in which the defendant's son, who emigrated to Israel, is killed in combat.
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