It's 1925 and a weekend party is taking place at the country house of Colonel Nickerson when a fabulous ruby belonging to a wealthy Maharajah is stolen.
Rehearsals for an am-dram murder mystery at a local village hall are interrupted when the murder victim is murdered for real. Fortunately the local police constable is on hand, playing the butler, to lead the investigation.
A top scientist at a government research facility has discovered a new and revolutionary formula - but is gunned down in his lab before he can take the credit for it. Can the panel make the necessary calculations and find the culprit?
At a ballroom dancing contest held for workers at a chemicals factory, one particular couple seem to attract the judges' attentions - but for entirely fatal reasons...
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Top Gap
By what name was Whodunnit? (1972) officially released in Canada in English?