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THE FINAL OMNIBUS OF AGATHA CHRISTIE'S 1920S NOVELS, COMPLETE WITH EXCLUSIVE BACKGROUND NOTES ON EACH ONE. THE SEVEN DIALS MYSTERY When a practical joke involving eight alarm clocks backfires with tragic consequences – and the disappearance of one of the clocks – dapper Jimmy Thesiger and his irrepressible girlfriend are drawn into the conspiracy involving the theft of scientific secrets and seven masked crime-fighters… PARTNERS IN CRIME When asked to take over Blunt's International Detective Agency, Tommy and Tuppence Beresford leap at the chance. And after their triumphant recovery of a valuable pink pearl, a whole string of challenging cases come their way… THE MYSTERIOUS MR QUIN Mr Satterthwaite, a keen observer of human nature, has his life transformed when, after midnight on New Year's Eve, a tall and slender stranger appears as if from nowhere. Who is the enigmatic Harley Quin? And why does he shroud himself in such mystery?