The Long Shadow is a 1932 mystery detective novel by Anthony Gilbert, the pen name of British writer Lucy Beatrice Malleson.

[1] It is the seventh of ten novels in a series featuring her amateur detective and politician Scott Egerton, a precursor to her better known creation Arthur Crook.

[2] Mademoiselle Robert had twenty five years earlier been a celebrated star on the Parisian stage before drifting in anonymity.

Now she has been founded dead in a slum-like tenement in London, with a knife through her heart.

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