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The Fourth Square (1961)

IMDb: 5.8
1961

The Police investigate a theft of emerald jewelry which had led to a murder

Clue of the Twisted Candle (1960)

IMDb: 6.3
1960

An unscrupulous businessman frames a rival for murder, then is himself found murdered in a locked room

Clue of the New Pin (1961)

IMDb: 6.4
1961

TV journalist Tab Holland assists Scotland yard with the murder of a reclusive millionaire whose corpse is discovered locked in a vault The key to the vault is mysteriously found on the table beside the corpse