Murder on Lexington Avenue by Victoria Thompson - 2010: A Gaslight Mystery

In good condition - ex library - has markings from use - due to differing weights in books, postage maybe adjusted at checkout.

When a wealthy businessman is murdered, Detective Sergeant Frank Malloy is assigned to investigate, even though the crime is out of his jurisdiction. The reason, he soon realizes, is that the man has a deaf daughter - and it is well known that Malloy's own son attends the New York institution of the Deaf and Dumb.

The victim sent his daughter to a rival institution with different views on teaching the deaf and was an influential supporter of their program. Malloy suspects that the killer may be affiliated with his son's school. Or it might be a family member. Or a business rival. It's a difficult case, but one that Malloy is sure will not involve Sarah Brandt - until the new widow goes into labour while he is interviewing her, and she refuses to send for her own physician...

So Malloy calls upon Sarah. Finding herself in an unfamiliar world, where those who can hear refuse to listen to those who cannot, Sarah must determine who is right and who is innocent before she and Malloy can ever hope to find the killer.