King is an anomaly in the Japanese prison camp. One of only a handful of Americans amongst the British and Australian inmates, he thrives through his conniving and black market enterprises; whereas others, nearly all of higher rank, struggle to survive sickness and starvation while trying to keep their civilised nature. King recruits upper class British RAF officerFlight LieutenantPeter Marlowe to act as a translator. As they become acquainted, Marlowe comes to like the man and appreciate his cunning. King respects Marlowe, but his attitude is otherwise ambiguous; when Marlowe is injured, King obtains expensive medicines to save Marlowe's gangrenous arm from amputation, but, despite the fact he stays by the sick man's bedside, it is unclear whether he does so out of friendship or because Marlowe is the only one who knows where the proceeds from King's latest and most profitable venture are hidden. King has a different relationship with the lower class, seemingly-incorruptible British Provost, First Lieutenant Grey. Grey has only contempt for the American and does his best to bring him down. Then Grey has to deal with an unrelated dilemma when he accidentally discovers that the high-ranking officer in charge of the meagre food rations has been stealing. Grey rejects a bribe and zealously takes the matter to Colonel George Smedley-Taylor. To his dismay, Smedley-Taylor tells him the corrupt officer and his assistant have been relieved of their duties, and orders him to forget all about it. Grey accuses Smedley-Taylor of being in on the scheme, but the tampered weight he presented to the colonel as evidence has been replaced, so he no longer has proof of the crime. Smedley-Taylor offers to promote him to acting captain: when a troubled Grey does not respond, Smedley-Taylor takes his silence as consent. The core idea in the film, and title, is that King starts breeding rats and selling the meat to the guards, telling them it is mouse-deer. The British love of animals is doubly offended when a pet dog is required to be killed for killing a chicken, but is put to good use when it itself is cooked. A chosen few relish the meat. The stakes are raised when they get a diamond to sell. In the camp politics the collusion with the guards show them as almost equals, and it is the British Lieutenant who represents the "evil" of the system, in his suppression of all enjoyment and enforcement of the internal rules. The British camp commandant summons the four other senior British officers, and they are required to go to the Japanese commanders quarters. There the commander reads a scroll while a junior officer translates. This notifies them that the Japanese have surrendered, and that the war is over. After overcoming their shock and disbelief, the prisoners celebrate – all except King. He realises he is no longer the unquestioned ruler of the camp. Weaver, a lone British paratrooper appears from seemingly nowhere, walks up to the prison gates and fires a revolver in the air causing the guards to surrender. The prisoners are stunned and are too shocked by the sudden events to speak to the paratrooper, except King. That King appears fit and is well-dressed among the other prisoners clad in rags makes the paratrooper suspicious and accusatory as to how that could be. King manages to squelch a premature attempt by resentful underling First sergeant Max to reassert his rank and authority, but that only delays the inevitable. When Marlowe speaks to him before King's departure from the camp, King belittles it, saying "you worked for me, and I paid you". Australian medics arrive and take care of the wounded. They begin a checklist of inmates against the records. The Americans are put on a truck ahead of the British. Marlowe rushes to say goodbye, but is too late, and simply watches the truck of men drive off.
Cast
appears near the end of the film as Captain Weaver, a paratrooper who is sent ahead to claim the prison from the Japanese, as the war has ended. An American sergeant rounds up the Americans to send them home.
