LONDON -- Period detective stories can women rubbing their nipples during sex videossometimes be frustrating because they're oh so predictable.

You invest time in your favourite amateur sleuth only to find them confront a suspect who readily admits everything without putting up a fight.

This all too familiar problem has been summed up brilliantly by one Twitter user.

Author Alexis Hall tweeted some very useful advice to characters who find themselves accused of murder in the 1920s.

Hall begins the series of tweets by setting the scene in an English country house in the 1920s; reminiscent of an Agatha Christie murder mystery.

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The plot's dénouement features a dramatic confrontation in an opulent drawing room.

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Hall points out that this is a highly important moment for anyone who stands accused of murder.

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Instead of admitting to the crime, why not just deny it completely?

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Hall admitted that this theory definitely did notarise from him reading an awful lot of Agatha Christie novels over the holidays.

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Simple as that.