A follow-up to the 2011 crime drama will see Paddy Considine reprise his role as Jonathan 'Jack' Whicher - the real-life pioneer who worked in the newly-established Detective Branch of the Metropolitan Police during the 19th Century.
"We're delighted Paddy Considine has agreed to reprise his role as Jack Whicher, the most celebrated detective of his day," said ITV Drama's Laura Mackie. "[Writer] Neil McKay has taken the character and produced a gripping and compelling story."
The first Suspicions of Mr Whicher was based on the best-selling book by Kate Summerscale, with the author giving her blessing to the new sequel.
Hat Trick's Head of Drama Mark Redhead explained: "After Jack Whicher left the Met, he continued with his vocation as a detective as one of the first so-called 'private inquiry agents'.
"This story launches him into that career, and he becomes involved in a disturbing and puzzling murder case which brings him into conflict with powerful figures including his former colleagues in the Metropolitan Police."
The Suspicions of Mr Whicher II will begin filming on January 7, 2013 in Oxfordshire, Bedfordshire and central London, with Christopher Menaul (Prime Suspect, Zen) attached to direct.
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Watch a trailer for the first Suspicions of Mr Whicher film below: