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A tip-off reveals that an attempt will be made to knock out a heavyweight championship contender on an airline flying from Los Angeles - before he can even reach the ring in London.
On a flight from Montreal, young Mrs Clandon dies, apparently of heart failure, another passenger, the elderly Mrs Pendenny accuses Mr Clandon of murdering his wife. Obviously her charges must be investigated - but Mrs Pendenny is known by her friends, among them Mrs Trapp, to be an incorrigible liar …