Eliza bumps into Arabella Herbert, the girl who made her life a misery growing up. But as an adult, Arabella seems kind and considerate and everybody loves her. So when Eliza suspects she may be a criminal, no one wants to hear it, least of all Duke.

Detective Fitzroy sees one of his colleagues plant evidence on a suspect. With Duke away, Fitzroy turns to Eliza and hires her to look into a case of police corruption.