Silence in Hanover Close — Anne Perry

When Inspector Thomas Pitt was asked to reopen a three-year-old murder case which had taken place in London's luxurious Hanover Close, he was all too aware that his superiors wanted him to smooth thinks over.

But penetrating the reserve of high society households would take more finesse than Pitt could muster. Enter Charlotte Pitt, his wellborn wife, and her sister, Emily. As the social equals of the inhabitants of the Close, the women would be privy to conversation that would never reach the ears of a mere policeman. What they found was a secret so shocking it would lead to more deaths--and quite possibly Pitt's own....